There is only one ending, which you can continue from in the addon (to be released around September), either from a previous save or with a new character.
Pre-expansion, I like to think of the good ending as this:
You try to enter the Maxos temple and encounter Rhode and the Dragon slayers. She detects the Dragon Knight aura of you, and orders the Slayers to do so. There is an honourable combat, which you lose without taking a single Dragon Slayer with you.
