I'm playing a hard/trial of iron game. Itumaak is stuck in a wall on the second level of Cliaban Rilag.
Trying to exit the map doesn't work ("gather your party..."); targeting him with an attack to knock him prone doesn't work (attacking character cannot find a spot from which to attack him); attacking him with ranged attacks does not work (again, the character cannot find a spot from which to target him); having Itumaak attack a friendly character does not work (he remains motionless, stuck in the wall); cannot kill him with area affect spells (apparently he is behind the wall and is immune); and resting as far away from him as I can get on the level did not help.