dirigible isn't quite right, you need 15 things scattered through the game's world to open the door. Of these, 13 can definitely be acquired completely through non-combat means (just walking, being invisible, sneaking, etc). One of the 15 is dubious; I don't know if you can sneak to collect Braccus' treasure chest or not, and even if you do, you can only get the key from killing him (or pickpocketing?), and I don't know whether it's lockpickable or if there is a way to smash it to pieces somewhere else, etc. The last one would definitely involve a fight; there is no way to kill the totem without a battle afterwards, so they will try to attack you, and there's a chance you might not be able to flee before they kill you. (I guess you could just grab what you need and skedaddle instead of killing them.)
But even then, there are 5-6 required fights in the entire game. Two of these are before you even get to Cyseal; two of these are the final encounter itself. Who knows, maybe you can skip the pre-Cyseal ones if both of your characters start with Walk in Shadows; in which case, there would be 3-4 required fights in the game.
It might be cool to see if anyone can take a "noncombat challenge" and beat the game with only the absolute minimum number of fights.
Last edited by ScrotieMcB; 29/07/14 09:29 PM.