Collision damage, ie: getting stomped, smacked, launched, etc into walls 1 hit k.o. I once had 4x resist with Omnioculus while invis, and 100 resilience, Gahlran jumped into me and I was launched into a wall and died. I wouldn't even mind being able to survive with 1-10hp from collision without spec'ing into dmg resist. Also not sure if there are any mods or any ways beside blocking with a sword that would negate some collision damage.
That's not all they need to fix, pve flinch is also dumb af, self damage is another, many many other issues, people to busy complaining about pvp, when pve is not much better, it's kind sad when you watch a top tier player solo any dungeon and the reality is, it's not skill its rng that kills you or keeps you alive, not a Healthy way to develop a game where rng everything is at the helm.