About breaking the main quest by ignoring the dialogue options when you first talk to Zandalor, I tried it, it doesn't work. When you talk to the other marked one at Dwarven, you get the Find Zandalor quest directly (though you do not fail the quest to meet Zandalor, because you never get it).
That could be helpful for someone who wanted to get as few "quest failed" messages as possible. (Although it's impossible to get a perfect quest record because :
When you and Zandalor teleport out of the Stormfist Castle treasure room, you witness the death of Wouter. Then you automatically get "quest failed", "and the third marked one!" after you go to his dead body with Zandalor there, where you both realize that you are the last marked one left alive and therefore the last chance for the 7 races.
)
