Vrispwing Hive (2.5e Environment)
From D&D Wiki
These large hives are usually found underground in forested areas. The hive structure usually consists of expansive caverns and chambers. At the heart of the hive lives the Vrispwing Queen. Low-level players would be advised not to even enter one of these hives.
Vrispwing (2.5e Creature) 50-10000
The layouts are random and can be made by the DM.