Also wanted to share my oath breaking experience (Oath of Ancients):
I freed Halsin and then asked him to fight with us to clear out the goblins. Everything went well until the room with Plagg, Nik-Nuk, and Crub. The goblins aggroed on sight of Halsin (bear), and as soon as combat ended, I got the oathbreaker cinematic. I was confused and reloaded to see if I'd done something amiss. Nope -- not sure why those goblins triggered the oath break but other goblins and even the Zhent didn't.
I don't mind a sensitive oath that actually needs to be obeyed, but it's frustrating to feel like I stumbled into breaking my oath and don't understand what specifically I did.