A hive can spawn when opening an ancient structure or at Infestation events. It is imperative that you destroy it as fast as possible. A few seconds after encounter, it will start to deploy insects like megascarabs, megaspiders and spelopedes. Megaspiders or spelopedes tend the hives, and without these "guardians", the hives will perish 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. As well as mine random tiles which sometimes lead to Collapsed rocks falling from above and killing anything below.
If left untouched, each hive will spawn another hive within a few tiles in a progressive pattern. The time between hive reproduction depends on dfficulty. Hives can increase the temperature of their surroundings up to 38°C. It spawns 20 Insect jelly within 10.4 to 12 game hours in its direct radius, and 1 Glow pods within 12 and 24 game hours. Hives take damage at -20°C.
During Infestation, full waves of insects appear during the first few seconds. The hives will not expand to tiles without roof, but may on tiles without overhead mountain.