Chill Touch

Necromancy Cantrip (Sorcerer, Warlock, Wizard)

Casting Time: Action
Range: Touch
Components: V, S
Duration: Instantaneous

You channel the chill of the grave toward one creature you try to touch. Make a melee spell attack against the target. On a hit, the target takes 1d10 Necrotic damage, and it can't regain Hit Points until the end of your next turn.

Cantrip Upgrade: This spell's damage increases by 1d10 when you reach levels 5 (2d10), 11 (3d10), and 17 (4d10).

Source: Bastions and Cantrips