Brain Freeze

You point at one creature you can see within range, and a illusory ice spike forms at the target, penetrating it's skull and partially freezing its brain. The target must succeed on a Wisdom saving throw or take 1d8 Psychic damage. If the target is missing any of its Hit Points, it instead takes 1d12 Psychic damage.

Cantrip Upgrade. The damage increases by one die when you reach levels 5 (2d8 or 2d12), 11 (3d8 or 3d12), and 17 (4d8 or 4d12).