Blizzard

With the innate magic flowing through you, you bend the weave of magic and release a blast of concentrated ice. Make a ranged spell attack against a target in range. If it hits, the target takes 10d6 cold damage and immediately is frozen in place until the end of their next turn, making them vulnerable to fire damage and restrained. 

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 2d6 for each slot level above 4th.

A creature killed by this spell is encased by ice, and completely frozen until thawed out.

This spell cannot crit. Instead, on a dice roll of 20, add 4d6 damage dice.