Raider

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Raiders are enemies who attack in groups when the storyteller's threat cycle is active (or any time, for Randy Random). The group size and strength of a raiding party is determined by 'points', which will be explained in-depth further down this article.

Raiders have several strategies when an a raid event is spawned.

Raiders will attack, destroy, or burn random targets without any visible strategy or tactic. They will not attack natural rock walls (except sappers), wild animals, or unpowered turrets. They will, however, engage prisoners from enemy factions.

If the raiders cannot find any structures to destroy, or undowned colonists to attack, the behavior will change into other goals: stealing valuables that are not properly stored in closed locations, kidnapping downed colonists to demand a ransom of silver or to recruit them into their ranks, leaving after being satisfied with the damage done, or giving up and retreating due to exhaustion and starvation.

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  Ransom

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  Raider's negative thoughts

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  Pirates have given up and are leaving

• 

  Abandoned prisoner returns to ambush a caravan.

Once you have downed or killed half of their crew, the remaining will flee in panic, running as fast as they can towards the map edges.

Raiders who survive may return to attack again in future raids or ambushes. This includes prisoners abandoned from caravans who are in restraint, making them unable to attack properly.

Equipment

This Google Sheets spreadsheet shows the spawn rates of weapons and apparel across all raider kinds. Valid as of 1.0.2057. Figures are taken from a modified version of the 'Pawn Kind Gear Sampled' dev tool with a sample size of 10,000 rather than 400.

Weapons

Raiders have limited equipment possibilities; dependent on their weapon and apparel budgets, and what equipment 'tags' they are allowed to equip. Usually on Cassandra Classic and Phoebe Chillax they come equipped early on with mostly autopistols and crude melee weapons, some bolt-action rifles and pump shotguns later down the line. In the late game they can come equipped with things such as frag grenades, sniper rifles, incendiary launchers and machine pistols. Rarely some will have assault rifles or LMGs.

A raiding party may include members equipped with melee weapons and shield belts. When a raiding party includes grenade throwers, the AI is intelligent enough to run way from grenades thrown by their own faction (though this does not apply to other explosives). Raiders wielding rocket launchers will attempt to avoid friendly fire.

Counterintuitively, they can and will quite often spawn with melee weapons that result in them having a lower DPS than unarmed combat.

Also, raiders do not always use weapons appropriate to their skills, as the weapons are randomly chosen. They are often seen equipped with ranged weapons when they are better at melee (completely disregarding the Brawler trait), and vice versa.

Armor

They come in different clothing depending on their type and the outside conditions. If it's cold at your colony, they will come wearing parkas and tuques, but they don't usually wear dusters and cowboy hats in the heat.

Humanlike

There are multiple types of raiders in RimWorld, each with their own sets of equipment and budgets which the game uses to 'buy' their equipment. Similarly, the game 'buys' raiders by deducting the raiders' Combat Power rating from the amount of raid points.

Weapons that are in bold are weapons that a raider kind is particularly likely to equip; weapons that are in italics are weapons that a raider kind is particularly unlikely to equip.

Raider types are exclusive to their faction - mercenaries being exempt.

Tribals

Tribal fighters, weak but expendable. They never carry silver or medicine.

Pawn Type	Image	Combat Power	Gear Health (%)	Avg. Gear Quality	Clothing Budget	Weapon Budget	Available Weapons	Age Range	Additional Info
Penitent		35	20-110	Poor	50-100	90-150	Club, Knife	Up to 60	Occasionally has wooden prostheses
Archer		48	50-180	Poor	180-350	80	Short bow	Up to 60	Rarely has wooden prostheses
Warrior		60	50-180	Poor	200-300	150	Ikwa	Up to 60	Always has war veil.
Hunter		65	50-180	Normal	200-300	100	Recurve bow	Up to 60	Always has war veil. Tribal traders are based on this pawn, though they have tribal headdresses instead.
Berserker		90	100	Normal	200-550	300	Spear	Up to 60	Always has war mask.
Heavy Archer		90	100	Normal	200-550	250	Greatbow, Pila	Up to 60	Always has war mask.
Archer chief		130	100	Normal	450-750	500-1000	Greatbow	At least 30	Always has tribal headdress and plate armor. Difficult to recruit. Can be faction leader.
Berserker chief		130	100	Normal	450-750	500-1000	Longsword, Spear	At least 30	Always has tribal headdress and plate armor. Difficult to recruit. Can be faction leader.

Pirates

These units are encountered most frequently in the early game, but you'll see these units throughout the game. All easily dispatched once you get armor and high-grade weapons.

Pawn Type	Image	Combat Power	Gear Health (%)	Avg. Gear Quality	Clothing Budget	Weapon Budget	Available Weapons	Age Range	Additional Info
Drifter		35	20-60	Poor	90-280	60-200	Club, Knife	Any	Never carries food. Occasionally has wooden prostheses.
Scavenger Thrasher		45	40-110	Normal	300-800	100-160	Club, Gladius, Knife, Mace	Any	Rarely has wooden prostheses.
Scavenger Gunner		45	40-110	Normal	300-500	200-300	Autopistol, Bolt-action rifle, Machine pistol, Pump shotgun, Revolver	Any	Rarely has wooden prostheses.
Pirate Gunner		65	70-230	Normal	400-1000	250-345	Autopistol, Bolt-action rifle, Incendiary launcher, Machine pistol, Pump shotgun, Revolver	Up to 65	Rarely has wooden or standard prostheses.

Outlanders

As friendly units, they show up in caravans or friendly reinforcements. Rough outlander unions will also send these to attack your colony in the early game.

Pawn Type	Image	Combat Power	Gear Health (%)	Avg. Gear Quality	Clothing Budget	Weapon Budget	Available Weapons	Age Range	Additional Info
Villager		35	20-200	Poor	200-400	65-250	Autopistol, Knife, Machine pistol, Revolver	Any	Rarely has wooden or standard prostheses.
Town Councilman		40	100	Good	700-1200	200	Autopistol, Revolver	At least 30	Always has bowler hat. Only one can show in a raid. Occasionally has standard prostheses or bionics.
Town Guard		55	60-200	Normal	400-600	250-400	Autopistol, Bolt-action rifle, Heavy SMG, Incendiary launcher, Machine pistol, Pump shotgun, Revolver	Any	Rarely has wooden or standard prostheses.

Mercenaries

Elite units typically encountered from mid-game onwards. Joins the Outlanders or Pirates in their ranks.

Pawn Type	Image	Combat Power	Gear Health (%)	Avg. Gear Quality	Clothing Budget	Weapon Budget	Available Weapons	Age Range	Additional Info
Grenadier		65	70-230	Normal	400-700	500	Frag grenades, Molotov cocktails	Up to 65	Rarely has wooden or standard prostheses.
EMP Grenadier		65	70-230	Normal	400-700	500	EMP grenades	Up to 65	Rarely has wooden or standard prostheses.
Mercenary Gunner		90	70-320	Normal	1000-1500	330-650	Assault rifle, Autopistol, Bolt-action rifle, Chain shotgun, Heavy SMG, Incendiary launcher, LMG, Machine pistol, Pump shotgun, Revolver	Up to 65	Occasionally has standard prostheses or bionics.
Mercenary Sniper		110	70-320	Normal	1000-1500	600	Sniper rifle	Up to 65	Occasionally has standard prostheses or bionics.
Mercenary Slasher		150	70-320	Normal	300-1400	200-500	Gladius, Longsword, Mace, Spear	Up to 65	Always has shield belt. Occasionally has standard prostheses or bionics.
Heavy Mercenary		150	70-320	Normal	200-350	1200	Doomsday rocket launcher, Minigun, Triple rocket launcher	Up to 65	Occasionally has standard prostheses or bionics.
Elite Mercenary		150	100	Normal	2500-3500	500-1400	Assault rifle, LMG	Up to 45	May have bionics. Bosses are functionally identical and may be faction leader.

Spacer

These people don't appear in normal raids but are found in ancient shrines. This variety is always hostile to the player's faction.

Pawn Type	Image	Combat Power	Gear Health (%)	Avg. Gear Quality	Clothing Budget	Weapon Budget	Available Weapons	Age Range	Additional Info
Ancient Soldier		100	100	Normal	0-3800	300-900	Assault rifle, Autopistol, Bolt-action rifle, Chain shotgun, Heavy SMG, Incendiary launcher, LMG, Machine pistol, Pump shotgun, Revolver	Any	May have bionics or power claws.

Mechanoid

Main article: Mechanoid

Mechanical enemies that neither feel pain nor seek cover.

Pawn Type	Image	Combat Power	Gear Health (%)	Avg. Gear Quality	Clothing Budget	Weapon Budget	Available Weapons	Age Range	Additional Info
Scyther		160	100	-	-	-	Melee (Blades)	Any	-
Lancer		160	100	Normal	-	9999	Charge lance	Any	-
Centipede	File:MechanoidCentipede.png	400	100	Normal	-	9999	Heavy charge blaster, Inferno cannon	Any	-
Pikeman		110	100	Normal	-	?	Needle gun	Any	-

Mechanoid Cluster

Main article: Mechanoid cluster

Added in Royalty was the "Mechanoid Cluster" event, which may be associated with quests or drop on their own. During this event, a fleet of drop pods will land and deploy mechanoids, walls, turrets, and assorted buildings. These mechanoids will initially be dormant. They are eventually awakened by either the player attacking, a Proximity activator being tripped, or a Count-down activator finishing its count down.

Raiders' Strategies

Immediate Attack

Raiders, upon either landing in their drop pods or arriving on the map sides, will proceed to instantaneously converge on your colony and attack. The best thing to do is to defend.

They have a 70% chance to arrive on foot at the map edges, and 20% to drop pod there, assuming they don't use other strategies and are capable of utilizing drop pods.

Mid-base Drop Pods

Raiders will drop pod right into the middle of the base, circumventing all exterior defenses. They may drop into roofed rooms, punching a hole in the roof. They do not care if the room is occupied, and in such cases colonists may only have a few seconds to stop what they were doing and get into fighting positions. If the raiders drop into an enclosed room without colonists they will start randomly attacking the contents of the room.

They have a 10% chance to choose to do so. Tribes do not have the technology to start a drop pod attack.

Immediate Attack Smart

Like Immediate Attack, but the raiders are unusually clever in their tactics because they try to avoid (some) traps and turrets, as well as simply steal some of your items and run. This can be devastating in early game, because a raider may steal your stockpile of components, leaving you without any means of using electricity.

Despite their description, they can still be funneled into a killbox with relative ease.

Preparation

Raiders, upon either landing in their drop pods or arriving on the map sides, will proceed to stand around in a small group near-by where they spawned for a period of time and then proceed to attack. It is possible and a completely viable strategy to attack them while they are "preparing". This preparation has no effect on their attack other than the fact that it gives you more time to prepare yourself.

Sappers

Instead of attempting to kill your colonists by traditional attack, sappers will mine or blast their way inside rather than hitting your walls or doors as usual.Their ultimate goal is to reach one of your colonists assigned beds. They will run around for a short time and continue to dig afterward if they are under attack.

The attacker with the best mining skill is chosen to dig. If that digger is killed the next best digger continues digging, and so on.

They can be fairly dangerous to those who tunnel into mountains as their defenses are usually concentrated at the entrances. The best thing to do is instantly assault them before they can mine too much. The other members will then carry on the normal assault. They seem to avoid digging through high-health ore veins or into the areas within the range of improvised turrets and don't mind much about other security traps (deadfall trap and all kind of IEDs). It's possible to create such an trap area to kill them before hand.

However, in open bases they are even worse than regular raiders as they come in smaller numbers.

Sappers can find one tile defenses, either natural rock or built walls. This may cause them to open ancient shrines unintentionally.

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  1: Sappers are good at finding one tile walls.

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  2: Sappers may even open ancient shrines unwisely.

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  3: Sappers attacking ancient structures will kill spacers you would love to recruit.

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  4: Sappers may cause mechanoids to function as your outer defense line.

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  5: Sappers are defeated.

Siege

Raiders enter your map from an edge and head towards a point to set up a makeshift siege base with supplies (steel, packaged survival meals, components, high-explosive shells and incendiary shells) received from drop pods, and wil construct 2 mortars and sandbags as cover.

You can intercept them before they start building up if timing is favorable to you. They will always construct two mortars regardless of the number of raiders. They rarely use their best constructors when building, sometimes failing to complete the mortars. As they will not get additional components, this will make them lose firepower.

Once ready, they will bombard you, with those not manning the mortars remaining on guard. Drop pods will continuously resupply 12 packaged survival meals and more mortar shells. They can receive different types of shell during the siege. After causing enough destruction, they will proceed to converge on your colony.

The siege team will not engage friendlies while heading towards their point until they actually start constructing or you assault them first.

Ambush

Raiders may choose to attack one of your caravans. In this case, they will charge right at your caravan without giving a second thought to strategy.

Multiple group attacks

Enemies can split up their attacking forces, attacking using multiple groups at once. Each group attacks from a different direction, and flees on their own accord.

Drop pod scatter

Enemies capable of drop pods have a chance of landing scattered across the map.

Weapon-specific raids

Humanlike raiders have the ability to send raiders with a specific kind of weapon only.

Melee rush

Pirate or outlander raiders have the chance to attack your base with mercenary slashers only, meaning everyone will be shielded and have a melee weapon. Tribals can do the same with their melee units, except without shields.

Mechanoids have their own rendition of the melee rush with scythers only.

Sniper party

Pirates or outlanders have a chance to send snipers only, meaning that all attackers will have long-ranged attacks.

Explosives assault

Pirates or outlanders have the chance to send a party consisting of either grenadiers or heavy mercenaries. While this makes them extremely destructive, it also makes them particularly prone to friendly fire.

Raid strength

A raid's size and strength is determined by the amount of colonists you have, your wealth, how many big threats you've had (for the early-game), how long your faction's been around for, how long it's been since one of your colonists were downed or killed, and your difficulty.

The actual raid strength is determined by points, which is calculated by taking into account the above factors that affect raid strength.

The below is technical information on the strength of raids, through the determination of points a raid has. All of the following information is from Alpha 17b, or 0.17.1557.

Points

Your first raid will always be 35 points, regardless of the above conditions. Additionally, the first raider won't randomly die upon being downed, and they will never flee.

The base formula for raid points could be expressed as follows:

P = (( C × 42 ) + ( iW ÷ 100 ) + ( bW ÷ 200 )) × ( sR × lR ) × D × T × R

Variable	Meaning	Value
C	number of colonists that your base has	Colonists are always worth 42 points, regardless of their condition
iW	base's item wealth	can be checked under the 'History' tab
bW	base's building wealth	can be checked under the 'History' tab
sR	short-term ramp-up factor	Check below
lR	long-term ramp-up factor	Check below
D	difficulty's threat scale factor (i.e. points multiplier)	0.05 on peaceful; 0.1 on base builder; 0.35 on some challenge; 0.65 on rough; 1 on intense; and 1.3 on extreme.
T	the number of big threats (i.e. raids, manhunter packs, mechanoid ship parts, and psychic waves) that your faction has experienced	0.5 for 1 big threat; 0.7 for 2; 0.8 for 3; 0.9 for 4; and 1 for 5 and greater. Simplified, T's value will be 0.5 for your faction's second-ever big threat, and so on.
R	the strategy that the raiders are using	1 for waiting and then attacking; 0.9 for immediate attacks; 0.85 for 'smart' attacks; 0.8 for sapper attacks; and 0.6 for sieges. For raids involving chased refugees it is 1.35.

Ramp-Up Factors

Ramp-ups (i.e. sR and lR) are substantially more complicated than any of the other factors involved:

sR is always 1 until 21 days in; in which case 0.000514403335 is added to it every 5,000 ticks (1.39 mins) - or 1 every 162 days.

lR is always 1 until 42 days in; in which case 0.000231481492 is added to it every 5,000 ticks - or 1 every 360 days.

If a colonist gets downed or killed, 1 is subtracted from both sR and lR - but these aren't the new values; only part of the new values. sR and lR then get multiplied by certain values independently, based on how many colonists you have, with the table below showing all possible combinations as stated in the code (RimWorld.StoryWatcher_RampUp):

Colonists	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16+
sR Multiplier	0	0	0	0	0.15	0.25	0.3	0.35	0.4	0.45	0.5	0.55	0.6	0.65	0.7	0.75	0.8
lR Multiplier	0	0	0	0.2	0.4	0.6	0.7	0.75	0.8	0.85	0.9	0.91	0.92	0.93	0.94	0.95	0.95

After sR and lR have been multiplied by whatever corresponding values, new sR and new lR both equal 1 + old correspondents.

After the base amount of points have been calculated, the game then factors in diminishing returns as follows, using nested 'if' statements, in pseudo-code form:

   IF P > 1000 THEN
       IF P > 2000 THEN
           P = 2000 + (P - 2000) * 0.5
       P = 1000 + (P - 1000) * 0.5

In layman's terms: if P is above 1000, then P is the average of itself and 1,000. However, if P is above 2,000, then P will first be the average of itself and 2,000, before averaging with 1,000.

Finally, with Randy Random, a raid's points gets multiplied by anywhere from 0.5x to 1.5x, meaning that you could face more or less powerful raids than usual with this storyteller.

Example

So now lets plug in some real-world numbers: your colony has 4 people, it's been 17 days, and this is the colony's third raid. Your item wealth is 11,000, your building wealth is 4,000, and you're playing on rough difficulty. The raiders are attacking immediately.

The values in the formula will be as follows:

C = 4
iW = 11000
bW = 4000
sR = 1
lR = 1
D = 0.65
T = 0.7
R = 0.9

Plugging these values into the formula:

P = ((4 * 42) + (11000 / 100) + (4000 / 200)) * (1 * 1) * 0.65 * 0.7 * 0.9 or
P = (168 + 110 + 20) * 1 * 0.65 * 0.7 * 0.9 or
P = 298 * 0.4095 thus
P = 122.031 or
P = 122

Therefore, the raid will be 122 points.

Defense Strategies

For a more comprehensive list of strategies, see Defense tactics.
For constructed defenses to hold against raiders, see Defense structures.

It is recommended to keep power generation, eating areas, lighting, doors, and walls near or behind a protected entrance, as raiders tend to set fire to them, potentially causing huge damage. Raiders will prioritize firing on colonists or turrets when those colonists or turrets are firing on them, but will otherwise prioritize random objects, meaning you can put doors or walls near your defenses to temporarily distract them.

Raider Preparation

Raiders will sometimes start by standing around in a group where they spawned and will continue this until they see a colonist nearby or they hit a certain preparation time limit, at which point they begin the assault. Because a colonist can set them off early, you can plan out the time you want them to attack. It is generally best to set them off early if you're well-prepared, to avoid potentially troublesome scenarios such as having no power when their timer runs out. Conversely, you should not set them off early if your defense is not prepared. Note that raiders usually take less than one day to begin, meaning that if there is an eclipse and you rely on Solar generators, you should not wait for them and should instead set them off early while you still have some power left. Also it's good to note that raiders will remember where your traps are. This doesn't apply to other factions, though—if, say, the Vipers of Power come in and sets off your traps, then they would remember that. But, if the Rippers of Fire later attack, they won't have that knowledge and will still set off the same traps.

Siege defense

When faced with a siege, there are a few coping strategies you can use.

You can choose to either to assault the mortar base or wait it out and repair the damage as best as you can. The choice mainly depends on the surroundings of the mortar base and your base's position. If your base is located under a mountain (your base tiles will read Overhead Mountain when you hover your cursor over them), the mortar shells won't be able to hit those tiles at all! This makes deep mining a very effective strategy against heavy bombardment. If you don't build your base into a mountain, you should at least consider digging out at least one panic room for your colonists to hide within from the shells.

If you assault their base, one possibility is sniping either the shells or the mortars, hoping an explosion kills many of the raiders. If you want to leave those intact, you can snipe the raiders themselves. Keep in mind that killing enough of them prompts them to assault your colony directly instead of continuing their siege.

Mechanoid assaults

Mechanoids come in 4 types, Lancers, Scythers, Pikemen and Centipedes. They have much differing stats and weapons, meaning different tactics may be used.

In most raids where they come/ drop in at the edges, the Scythers will outrun the Centipedes by a great margin, giving plenty of time to deal with them before the centipedes.

Lancers

Lancers are capable of mid-long range high damage attacks. If fighting it from a distance, cover along with mid-long ranged weapons such as assault rifles or bolt-action rifles are vital.

Due to the Lancers' weak melee ability and low health, melee fighting it is always the better choice.

Scyther

Scythers are dangerous melee fighters; they deal significant melee damage while forcing your gunners into melee combat. Usually, a 1v1 fight with a scyther and a gunner will result in the scyther emerging victorious.

Melee fighters are useful in guarding against scythers, being able to 'peel' them off from more vulnerable allies.

Pikemen

Pikemen can snipe your colonists from a very long distance, though their damage output is abysmal.

Due to the Pikemen's weak melee ability and low health, melee fighting it is always the better choice.

Centipedes

Centipedes, on the other hand, specialize in crowd control and area denial; the Minigun and Heavy charge blaster can annihilate groups of colonists, while the Inferno cannon sets your colonists ablaze and burns down your base if not careful. They are incredibly durable, sporting thick armor and high health, and can take many hits before they can be downed.

Centipedes wielding the Minigun and Heavy Charge Baster can be cheesed simply by making a lone colonist, preferably with a personal shield, stand in front of your other colonists. The centipede will target that colonist, but be unable to hit it due to the forced miss radii. Watch out for friendly fire.
The Inferno cannon is not as destructive towards your colonists, but is annoying to deal with. Keep watch on your colonists at all times, and remember to send them back into cover when needed. As a precaution, build your base out of non-flammable materials to prevent large-scale fires erupting all over your colony.

Engaging it in melee is not recommended due to its armor, high health and heavy damage.

Tribal raids

Tribal raiders come in large numbers, but with relatively poor equipment; as such, it may require different strategy compared to pirate or outlander raids.

Overall, they can deal heavy damage to your colonists; they do not have good weapons, but compensate with their sheer numbers.
However, as tribalwear does not provide protection and they do not wear any form of regular armor, they are easier to kill individually than other raiders.

Crowd control is an important aspect in defeating tribal raids. The Minigun or LMG is an effective weapon to use as it can easily mow down groups of raiders.

Explosive weapons are also useful in crowd control.

Explosive mortars, while inaccurate, can easily destroy a sizable group of tribals at once if they hit.
Grenades can hit archers hiding behind cover, though you have to risk a colonist or two in order to even get close enough to throw them.

Their archers are dangerous; their bows can be fired from a somewhat long distance, their pila can easily kill or incapacitate a colonist, and they always come in a large volley. As with most defensive strategies, cover is essential when fighting them.

Removing rock chunks also helps in dealing with tribal raiders hiding behind them, making them much easier to hit.

Version history

• 0.0.245 - Sniper squad and mercenary squad added.
• 0.3.410 - Raiders come from specific factions and don’t always drop from orbit. Tribal raiders now spawn and attack.
• 0.5.492 - Sieges added.
• 0.11.877 - Sappers added. Raiders now opportunistically ignite crops on fire.
  • A11B - Siegers can never use melee weapons. Enemies (especially wargs) now ignore unpowered unmanned turrets and mortars.
• 0.12.906 - Sappers now avoid mining through high-health ores and barriers. Siegers will never be sent with only melee weapons ... again?