So here's a nice bug, Kullervo has a phase of the fight where beams come out and he can repeatedly knock you around - if you get stuck in a corner during that phase, and die while your character is out of control, you lose the ability to self-revive, IF a teammate revives you before the timer runs out, you lose the ability to shoot, the ability to melee, the ability to run faster than a snail, the ability to go on a horse - honestly, you're just left with the ability to sit in the arena while everyone completes missions! Hurray!
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Replication:
During Kullervo fight, one of the phases has multiple ghosts, one of which has a cutscene that "stabs" Kullervo. I believe this is the fight that causes the issue.
- Fight is held inside of Kullervo's cell because he never left it.
- Player is inside cell "behind" Kullervo.
- Kullervo uses "Knockback beam of doom", it's super effective. Player is juggled indefinitely until death. If player dies while not in control of character, they become invalid upon revival.
NOTE: If timer runs out, and self-revival is used instead, player will generally be fine.
I believe this isn't Kullervo specific, I've seen this bug in normal gameplay outside of Duviri as well, but this fight is the most replicable version.
Seriously, please just add a /suicide command. There are too many bugs it would save us from.