Did you find the papers (in the Temple) talking about how the gem was being sent away through Greyport when the Temple was evacuated during the Goblin War? If yes, did you talk to Oliver (Merchant Inn owner) about the burned area?Let there be light, I can't continue my journey into Dragon Vix
Sidenote, did you find Sister Teresa's journal in the Temple? If yes, did you check out the burned area after finding it? Both are needed to get the recipe for Enhanced Fertility potions...