Conjure Snowstorm

You summon the wrath of a snowstorm. As you stare down your target(s) the air grows colder. The temperature drops below freezing. Clouds form above you and it starts to snow. You reach out at your target(s) and the snow starts to spin around all of you. All creatures within a 10ft radius are effected by this spell, unless negated by something else, as the snowstorm begins.

All creatures except those you choose take 

-4d4+4 cold for 4 minutes

-"Petrified" for 2 minutes if creature is brought below half HPs