Look for some frozen people.
Hint 1 of 6:
On the other side of the river near the avalanche, there will be a doorway
that you can melt with a spark spell.
Hint 2 of 6:
There are some lizard-sized passages beyond that doorway.
Hint 3 of 6:
They lead to a room where some people are frozen in ice in the wall.
Hint 4 of 6:
You can melt that ice as well.
Hint 5 of 6:
Use a spark spell as you're facing the center person, and the ice that's
holding him will melt a bit.
Hint 6 of 6:
And release the bow he's holding.