Charlotte's Full Moon

You float upwards, creating a moon around yourself and launching it at a target.

Everyone within 15ft of the target must make a DEX Save against your spell DC, the target at the center makes this Save at disadvantage. Creatures that fail the Save take 8d8 Cold damage, or half as much on a success.

Regardless of a success of failure, any creature hit with this spell is marked for 1 minute. When marked in this way, they take an additional 1d8 Cold damage whenever it takes damage from a magical source, whether it be magic items, spells, or character abilities

The damage of the Initial Impact increases by 2d8 and the Radius increases by 15ft for each spell slot level above 6th