Arctic Blast

Ice Spell, Tier 5, 2 Actions, AoE

Reach: Cone 4. Damage: 4d6+10 damage. This area is difficult terrain until the end of your next turn. Surviving creatures must make a STR save or be frozen in place (Restrained) until the end of their next turn; creatures already Hampered are Incapacitated for 1 turn instead. Upcast: +1 Reach.

From Core Rules