How do I pass the Ice trial?

Hint 1 of 5:

What is the best spell to use against ice?

Hint 2 of 5:

If you burn it, it will crack.

Hint 3 of 5:

Maybe you should widden that crack.

Hint 4 of 5:

Do you have a spell that could force it wider?

Hint 5 of 5:

Use the force bolt three times against the ice.