Hmmm ... since your Dragon Knight have two magical stones with him in Ego Draconis:
the Dragon Morph Stone and the Dragon Stone, I think you can still go back to the Battle Tower and your servants, Battle Tower Coffer ... in Flames of Vengeance !
... UNLESS ...
your two Stones are taken away for some reason (forever or temporary)? smirk

On 7th of february 2015 : I start a new adventure in the Divinity world of Original Sin,
it's a Fantastic Freaking Fabulous Funny ... it's my All Time Favorite One !