Cold Snap

All of the heat in the air in a 40ft cone in front of your hands is gone. Each creature in the cone must make a Constitution saving throw. A creature takes 6d8 cold damage on a failed save, or half as much damage on a successful one. If a Small or Medium creature is reduced to 0 hitpoints, it dies and becomes a glacial zombie. Up to two of the glacial zombies of your choice are under your control. The others are neutral to you and wander off.

As a Bonus Action on each of your turns, you can mentally Command any zombie under your control if it is within 120 feet of you (if you control multiple zombies, you can Command any or all of them at the same time, issuing the same Command to each one). You decide what action the zombie will take and where it will move during its next turn, or you can issue a general Command, such as to guard a particular chamber or corridor. If you issue no commands, the zombie only defends itself against Hostile creatures. Once given an order, the creature continues to follow it until its task is complete.

The zombie is under your control for 24 hours, after which it stops obeying any Command you have given it. To maintain control of the creature for another 24 hours, you must cast this spell on the zombie before the current 24-hour period ends. This use of the spell reasserts your control over up to two creatures you have created with this spell, rather than creating new ones.

At Higher Levels. When you cast this spell using a 7th-level spell slot, you can control or reassert control over three zombies. When you cast this spell using an 8th-level spell slot, you can choose to control up to four zombies, or you can control one Large creatures reduced to 0 hitpoints that become Large Glacial Zombies. When you cast this spell using a 9th-level spell slot, you can control up to five zombies, two Large zombies, or one Huge creature reduced to 0 hitpoints that becomes a Giant Glacial Zombie.