At end seal fighting archdiviner.
Teleports me into a cage, I break the door down and run back in to start range attacks on the archdiviner again.
Archdiviner has gone invulnerable.
Stood there like a clown until my party members got him down far enough to finish the seal off.
Also, this bug (perhaps related) as previously reported has happened to me and guild members in the harpy fractal where they will randomly go invulnerable when ranging them.
