Wow, fascinating plot. What an unusual story (I mean that in a good way!). I know next to nothing about Norse mythology but it was probably what I loved most about this fic. And the suspense! And all the dark, creepy elements. Lucius as Minister filled me with evil glee. I'm glad you didn't kill him off in the end. *g* Draco's wishes - ha, so totally Draco. (His wish about his hair amused me greatly!) And Harry giving in to temptation and making that first wish and then it was just a slippery slope, of course. Oh, Harry. I couldn't wait to see how all this would be resolved. Which brings me to - great battle at the end! And wow, you even found a way for Snape and James to finally make peace.
I loved Harry's kids. Especially Snape's relationship with them. The moment when Snape and Albus Severus first met made me go awwww.
Damn you for making me read bottom!Snape. Heh. But the next sex scene more than made up for it. ;-)
Gripping story!
PS. Were you inspired by ASOIAF? I haven't read those books but your title reminded me of them and I'm just curious. :-)