Guild Wars 2

The story became bugged at “Get the key to the captives’ cages.” The Krait Keymaster will sink me and then after I get back up he becomes invulnerable and I can’t attack him.

Once he became vulnerable again I would be able to attack him but if I got sunk again it would happen again.

I was finally able to finish it after 15 minutes of attacking him but not after he had 5-6 times of going invulnerable.

I imagine it’s linked to underwater combat constantly making targeted foes go invulnerable. I’ve often had this happen to me, even though my character was swimming at the same level as my target.

Yes, sometimes even a slight difference in relative height can make an underwater opponent go invulnerable. It doesn’t happen often, but can be seen from time to time.

Yeah, I think the height difference is what was causing it. He kept sinking me into the floor and then would become invulnerable.