Thank you to answer me, Raze.

We have already killed Zixzax and teleported him, but it does not work... :-(
After his death, he respawns and our bug is still here.

He can't move and says this all along the time : "I wonder what awaits you in the next chamber. I wonder what they'll say"

We are several players with this bug, why does Larian don't fix it with a patch ?
We can't continue to play and we're very disapointed because we love the game (we've backed DOS2...).

(sorry for my english).