I'm talking about the permanent sidequest given by the Elemental Slave starting perk. Rather than spawning Elemental Slavers once on a level, it seems to keep respawning them periodically, with a cooldown that can't exactly be called long. Going back and forth between levels, I fought them in the same spot about 5 times. As far as I know, the enemies spawned by these kind of quests should appear once per level, or at least, that's my experience with the Hogtied! and Wolf Trainee starts. Whether intentional or not, the unlimited respawns these enemies get makes them extremely frustrating to deal with, and even more so because of the AoE spam that Earth, Ice, and Water Elementals are capable of.

By the way, it'd be nice if in the furue there was a way to get rid of the sidequests given by these starting perks. Their novelty wears off after a while and they become tedious to deal with. Perhaps an optional bossfight located in the quest faction's jail?