Psychic harmonizer

The Psychic Harmonizer is a special psychic implant that projects the mood of the user to other pawns.

Acquisition

Psychic harmonizers cannot be crafted, and instead must be acquired through trade or as a quest reward.

Summary

Once implanted in a pawn, the harmonizer projects a psychic effect with a radius of 30 tiles that affects nearby pawns (of the same faction) with a moodlet.

This moodlet is dependent on the implantee's current mood value. It is linearly interpolated between these values:^[Rounding?]

−8 moodlet at 0% implantee mood.
0 moodlet at 50% implantee mood
+10 moodlet at 100% implantee mood.

This value is then multiplied by the Psychic Sensitivity of both the implantee and the subject of the effect. If a 100% mood implantee has 200% sensitivity, they'd give +20 mood buff. If both the implantee and subject have 200% sensitivity, the subject would receive a +40 mood buff.

The effects of multiple psychic harmonizers can stack. However, if a pawn has a psychic harmonizer implant, they cannot be impacted by another psychic harmonizer.

It only impacts members of the same faction. Slaves are considered to be part of their owners' faction for the purposes of the psychic harmonizer, not of their original faction.

Installation

Installing the part requires 2,500 ticks (41.67 secs) of work, 2x medicine of herbal quality or better, and a Medical skill of 5.

Removing the part requires 2,500 ticks (41.67 secs) of work, 1x medicine of herbal quality or better, and a Medical skill of 5.

If the operation fails, the part has a chance^{[What Chance?]} to be destroyed.

Analysis

Psychic harmonizers can be an extremely powerful tool to keep your pawns happy, if you install it in a pawn who is easily pleased. But if the pawn gets upset, it can quickly cause a "death spiral" of mood.

If used on a prisoner: the harmonizer is effective on pawns of the same faction as the prisoner. This can be used to keep other prisoners of that particular faction happy, or it can be used to reduce the mood of their faction's raiders.

Pawn Choice

The following aspects lend well to being a (mobile) harmonizer pawn:

Positive mood traits. Sanguine and Optimist have the most straightforward effect on the implantee's mood. Other traits like Body modder, Masochist, and Bloodlust also work well. Note that traits that impact Mental Break Threshold, like Iron-willed and Nervous, have 0 impact on the harmonizer.
High mood in general: Joywires provide a +30 mood boost. If a pawn is happy all day, they are a good candidate.
High Psychic Sensitivity. The higher the sensitivity, the greater the mood buff. It also means a greater effect from a psychic drone, so be very careful with this. Eltex gear and psychic foil helmets can be used to modify psychic sensitivity as needed.
Pawns that will naturally be near other pawns. For example, a psycaster can meditate all day (which also counts as Recreation) in 1 place. A passionate crafter can sit in a chair all day, gaining mood from the passion and the comfort of their chair.
"Disposable" pawns. Drugs and joywires may slow the work of a hauler, but do you really need that extra work speed?

Unconscious pawns are especially good with a harmonizer, though with the downside of being unable to move. See below for details.

Comatose pawns

A pawn's mood does not change when unconscious. If you can stack mood to 100%, then make a pawn comatose, you'll end up with a permanent +10 moodlet in the area (so long as the pawn is fed). Because the pawn is unconscious, even a psychic drone won't bother them, meaning you can stack Psychic Sensitivity as much as you want.

The easiest way to do this is with the Biotech DLC. A pawn with the Deathrest gene can willingly enter deathrest, where mood is frozen, and stay in this state indefinitely. A deathrester can be woken on-command, allowing you to replace eltex gear as needed. As a side benefit, pawns don't need food during deathrest.
An alternative method is to use brain damage. The goal is to get Consciousness below 30% (but above 0%). You can use an already comatose pawn, but if needed, the fastest way to cause brain damage is to fail to install a brain implant (like a painstopper). If further Consciousness reduction is needed, you can use a joywire (-20%) and circadian half-cycler (-15%). If you need to make the pawn conscious again, then either go-juice or wake-up can be used for a Consciousness boost.

Regardless of method, your patient should have the highest mood and highest Psychic Sensitivity as possible. Using some combination of yayo, flake, psychite tea, beer, lavish meals, and fine meals should get all but the most devastated pawns to 100% mood (assuming they can take drugs at all).

Defensive use against Enemy Raids

Always remember that installed harmonizers only affect pawns of the same faction, and that a psychic sensitivity of >0 is essential for both the prisoner and raider.

Ensure the prisoner is as unhappy as possible; use mindscrews, feed them kibble, and do whatever else you can to unappease their ideological requirements (Ideology DLC).
Build a long corridor/maze to maximize the time enemy raiders spend in the influence zone of the harmonizers. The spacing of prison cells will depend on the width of your corridor; for a 5-tile wide corridor, a spacing of 25-tiles between cells is optimal. Building the corridor underneath overhead mountain is ideal to stop drop pods from skipping the corridor.
It's advisable to make the prison cells at least 3-tiles in area so as to fit a sleeping spot, and a heater or cooler. Again, refer to the prisoners' ideologies when creating the worst possible cell for them.
It's also strongly recommended that you remove all prisoners' legs to prevent them from having mental breaks and escape attempts.

A single prisoner at 0 mood, with a psychic sensitivity of 125%, will cause -14 mood in a raider with 100% psychic sensitivity. This will stack by adding more prisoners within the harmonizers' range, but remember that harmonized prisoners cannot be affected by the harmonizers of other prisoners. By pairing this with other negative moodlets (or simply using enough prisoners), it is possible to make a raiding party go berserk and attack each other until they flee or give up. The longer the corridor, the more chance they will break before reaching your colonists.

This strategy is expensive to set up, but requires only kibble (and potentially power/wood for temperature control in prison cells) to maintain. Eventually the prisoners will die of natural causes and need to replaced, so be sure to harvest their installed implants before they die.

This will not be effective against sieges unless you can force them to attack.

Above is an example image (the plans in the image show the 25-tile spacing for the corridor width of 5-tiles) of an optimized corridor of psychically-harmonic deterrence, made for 1 specific enemy faction:

Artificial body parts

Arm/Hand: Archotech arm • Bionic arm • Power claw • Prosthetic arm • Wooden hand • Drill arm • Elbow blade • Field hand • Hand talon • Venom talon • Flesh tentacle • Flesh whip
Head: Archotech eye • Bionic eye • Bionic ear • Bionic jaw • Bionic tongue • Cochlear implant • Denture • Aesthetic nose
Head implants: Joywire • Painstopper • Circadian assistant • Circadian half-cycler • Gastro-analyzer • Learning assistant • Mindscrew • Neurocalculator • Psychic harmonizer • Psychic reader • Psychic sensitizer • Venom fangs • Control sublink (Standard, High) • Mechlink • Mech gestation processor • Remote repairer • Remote shielder • Repair probe
Spine: Bionic spine • Revenant vertebrae
Stomach: Bionic stomach • Nuclear stomach • Reprocessor stomach • Sterilizing stomach • Fleshmass stomach
Heart: Bionic heart • Prosthetic heart • Heart • Adrenal heart • Corrosive heart • Metalblood heart
Lung: Lung • Detoxifier lung • Fleshmass lung
Kidney: Kidney • Detoxifier kidney
Organs: Liver
Visceral implants: Death acidifier • Aesthetic shaper • Coagulator • Healing enhancer • Armorskin gland • Stoneskin gland • Toughskin gland • Immunoenhancer • Love enhancer • Ghoul plating • Ghoul barbs
Leg/Foot: Archotech leg • Bionic leg • Prosthetic leg • Peg leg • Wooden foot • Knee spike
Related: Psylink neuroformer • Xenogerm
Deprecated: Scyther blade • Psychic silencer