Dungeon Keeper Wiki

Permanent Traps[]

These cost stone to build, and take a set amount of time for an imp to build. They can be upgraded for more stone and time. They can be triggered repeatedly during a raid.  Two of these types of traps cannot be attacked by minions but can be disabled with the Disable Trap spell:

The rest of the permanent traps are destructible, meaning that they can be destroyed by minions or spells within a raid, but will be restored once the raid has completed. 

One Time Traps[]

These are triggered once then are gone. They cost gold to create, but are built instantly. They require no imp to build them. After being triggered by an attacking raid, you can recharge them individually or all at once.

Doors & Walls[]