Me and my friend were in Helgrind Warren and had defeated everything except the final boss. We had just defeated the two grendels. However, the doors to the final boss wouldn't open. When we got out of the room they looked open but when we approached, they closed. I was able to defeat Hall of Valor anyways, but I wanted to post it for other wizards,
See ya in the spiral, Hunter Bearhorn, Grandmaster Ice :)
