I found the main problem with Draconis was his first chain contingency(?). He would protect from magical weapons then cast Spell immunity: Abjuration so he was immune to breach... What I did after a few tries was just kill his first form with my main character (Cavalier +6 Holy Avenger Boots of Speed) who was immune to ALL of the first guys attacks, Horrid Wilting, his melee... Then as he changed form I ran away and sent a few summons at him to delay him as I waited for the Protection from Magical Weapons to wear off. Once that was done I summoned my planetars... and proceeded to lay some hurt down.
I found Draconis to be way harder than Abazigal, who went down first try.
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