Ascendancys end gyrion battle bug

mlswolf

Reached the end battle with gyrion with my dwarven fighter fought him down to nothing after he regenned, fought again but he gets hung on edge of area, can't target him, was able to use weapon master strike to wittle him down to no hit points. but doesn't die, quest won't end, tried moving to edge and doing unstuck, nothing seems to work. Tried twice to no avail.