- Heresiarch : Cultist monster which cast a volley of homing skulls. Extremely annoying in packs, since they slow the game to a crawl.
- Pit stone : Low fire damage missile, but it hits so frequently that you are stuck in hit recovery with cap FHR.
- Impaler Archon: Annoying as hell AI, deals high physical damage, in large packs you may get block-locked and killed by the other mobs. And it's missile bounces on summuns.
But the butthole glory award goes to Ahrihan in the Triune for 1 simple reason. He can cast Culling of the Herd 2 screens away, and through walls, which is both unfair and utterly frustrating.