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A hive can spawn in regions with caves or when opening an ancient shrine or at Infestation events. It is imperative that you destroy it as fast as possible. A few seconds after the encounter, it will start to deploy insects like megascarabs, megaspiders and spelopedes. Megaspiders or spelopedes tend the hives, and without them, the hives will begin to show lack of maintenance, and shortly afterwards will deteriorate in 2.5 in-game hours.
Insects will attack creatures trespassing the hive's boundaries, except for wild animals. They will not chase too far away and won't defend themselves from attackers outside the radius. They will also mine random tiles which sometimes lead to Collapsed rocks falling from above and killing anything below.
If there are less than 30 hives in a colony, non-dormant hives will reproduce another hive in a random roofed tile within 10 tiles of themselves. The time between hive reproduction depends on difficulty. The number of hives generated this way will never exceed 30, but it is possible to have more than 30 hives if they spawn directly from an infestation event.
Hives can increase the temperature of their surroundings up to 38°C. It spawns 20 insect jelly every 26,000 ticks (7.22 mins) to 30,000 ticks (8.33 mins), or 10.4 to 12 in-game hours, so long as there are is less than 40 jelly in adjacent tiles. It also spawns 1 Glow pod within 12 and 24 game hours.
During infestations, full waves of insects appear during the first few seconds. The hives may expand to tiles with an overhead mountain, but not roofs.
When destroyed they drop 30 insect jelly.
Dormant hives may be present in maps which have caves. Those hives will not spread, although they will produce jelly and glow pods as usual. They will also spawn with insects around them, but they will not spawn more over time.
They will initially generate with up to 200 combat power of insectoids, e.g. one megaspider and one megascarab, and can have up to 500 points of insectoids at one time alive at one time.