Why not use a stereotypical white dragon? It is the perfect place for it to live. But just give it a little zing-
half fiend white dragon. Cast protection from elements (fire) so with the immunity and protection spell, it should not be a problem. Plus, in Mag of Faerun, there is a spell aura agaisnt flame that would work well.
Plus, by adding a couple of cleric levels, the spells you use are 1/2 divine damage so their prep spells and gear will only be 1/2 as effective as they had hoped.
half fiend white dragon. Cast protection from elements (fire) so with the immunity and protection spell, it should not be a problem. Plus, in Mag of Faerun, there is a spell aura agaisnt flame that would work well.
Plus, by adding a couple of cleric levels, the spells you use are 1/2 divine damage so their prep spells and gear will only be 1/2 as effective as they had hoped.