Madae
This is just one of a few mechanics I noticed that is infuriating and need to be addressed in some way. There needs to be a limit to how many times a mob can cast certain spells in a fight so they aren't just sitting back on 20k health and doing this forever. Also the sticky sludge, or whatever the minotaur casters in FD cast that they'll do 6+ times in a row and CC you until you die. There just needs to be a limit on these.
Another spell that is anti-fun is the one mentioned in the summon paladin thread - this is just a ridiculous spell that makes fights harder than they should be in comparison to other options in the dungeon, and the negative affect of this is that you have people completely ignoring certain content because it just isn't worth the time or effort, especially since these dungeons are really not balanced for difficulty in that way - some mobs are just inherently easier and those will be the mobs everyone flocks to, not these lame, artificial difficulty, i-win button encounters that just aren't fun to play against at all.