Originally Posted by
walterKFX
It sounds like you're experiencing an issue with the "Going Postal" mechanic in Dungeon Keeper, where Warlocks or Wizards are using spells like Fireball to attack Imps that pass through the library while they're researching. This happens because they're irritated by creatures that don't normally use the library (like Imps) passing through while they're trying to concentrate.
To address this issue, make sure your Warlocks are not interrupted: Try keeping the Warlocks' study space clear of any non-relevant creatures, like Imps, by ensuring the library is set up in a way that only Warlocks (or creatures that are supposed to be there) walk through it.