Mechanics to add variety to dungeon mobs

[Arrius]

Large part of the reason why the random attacks are mostly irrelevant is because they are not followed up. The healer have all the time in the world to recover from them. But if there was a mob constantly of the healer, that would be a non-issue. It would need to be killed, unless the mobs die fast enough while the tank can be healed easily even with a random instant cast here or there to make the healer kiting the mob enough. Then again, that's already different too. Good enough in its own way.

Trash groups should remain trash, with some minor abilities too keep things interesting. Sure, you can add the occasionaly spongy, hard hitting dude inbetween (like the colossi and vanguard in doma), but anything more than that and people will take issue with it.
I don't need another level of problems like Biasts from the Aery or Sordets from Neverreap with their neverending cone/aoe attacks, which forces me to dodge them every second.
Dodging means distraction, distractions means DPS loss. And that is always a hazzle.

The dungeons need to be grindable for future content (relics, roulettes) or else we face another disaster like the Steps of Fate.