Chill Touch (Undead Grasp)

Channeling the chill of the grave, make a melee spell attack against a target within reach. 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. The damage increases by 1d10 when you reach levels 5 (2d10), 11 (3d10), and 17 (4d10).

Undead Grasp (Feat). When you deal damage with this Cantrip, you can expend a level 1+ spell slot to attempt to paralyze the target.  The target takes an extra 1d10 necrotic damage per level of the spell slot expended and must succeed on a Constitution saving throw against your spell save DC or have the Paralyzed condition until the start of your next turn.