Alright, here's some I pulled for Gidian.
First, we've got Last Stand. Loud, dark and intense. 'nuff said.
Second, there's Dark Ages. As implied by the name, 'tis dark.
Third, there's Armada. Not as dark, but a very intense and dramatic song. Has some interesting elements. One of my personal favorites.
Fourth, we've got Sons of War. Once again, intense and dramatic. See the recurring motif here?
Finally, just because there's too many songs out of this pool of cinematic music (and everything else) I could choose, we have All Is Hell That Ends Well. Starts off slow and soothing, but quickly escalates and ends in a verse of dubstep (yay for epic contrast).
I've got some wonderful ideas for Skadi, but I'll compile those in a later post. Most of Gidian's are TSFH because frankly, they have a plethora of music that seems to just perfectly fit him.