I finally got around to beating it yesterday('dumped' Xana, took skull and put it back)
The ending was interesting, with a touch of awesome, but was also a bit short in my opinion.
I am unsure if I want to reply it again to try for the other endings, or if I should just go to YouTube and see if they have the other three endings or not.
I am curious about redoing the last battle, getting adrenaline mode, and then see what happens if I try to use adrenaline boosted TK on Arantir (sp?) and try to launch him strait up... or maybe not... hard to say... as I said, I am debating if I want to replay it or not.
One thing I don't think I found.
Fire based daggers.
It seems like each type of weapon has a version with each type of 'element' (fire, ice, poison, lightning), but I don't think I ever ran into fire based daggers.

To be found in a coffin with a skeleton, level after you beat the first Cyclops. The first big room after the stairs.