So my friend and I were in the dungeon and we defeated Grubb together. However, only he got the quest marked as completed. Now when I go into the dungeon, Grubb isn't there but my quest log still says I have to find him. Marla is back outside at the death school, but when I talk to her I only get the message she said before I went into the sunken city. Meanwhile my friend has been able to finish the quest. Please help!