[andrewas]

Cheese, particularly smelly cheese at that :

Cast shapechage : illithid, cast timestop, slowly and careful consume draconis brain. Just dont claim to have beaten Draconis if you do it this way, you can only claim that if you kill him as a dragon.

Should you try that, use protection from acid scrolls as much as possible, and use anti-dragon tactics as you would for any other dragon. You cant do much with direct attack spells though, so Area spells are probably the way to go. GWW is also useful.