Infestation

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Infestations are an event and a serious threat in which a number of hives are spawned, alongside insectoid defenders. They can happen randomly or can be caused by a quest; quests will warn you if this is an outcome. Infestations can also occur upon entering rooms in an ancient complex; you will get no specific warning for this quest.

Spawning

Infestations require an area larger than 1x1, where at least one tile having the overhead mountain roof, within 30 tiles of a colony structure. They are centered around a single "valid" tile, which must have a temperature higher than -17°C (1.4°F). Temperatures under -8°C (17.6°F) will gradually reduce the spawn chances, as does light.

Hives and insectoids will spawn within a given radius, regardless of whether those tiles are valid. A hive does not have to spawn on an infestation's center point. The initial size of an infestation is based on raid points, so infestations will get bigger as the game progresses. If the size of the event is larger than the "valid" space, it will happily expand to appear in nearby "invalid" areas, even if those areas are not directly connected.

Preventing Spawn

File:PSA INFESATIONS.PNG
Blue squares show an area with a chance of infestations spawning.