Darkness Touch

Channeling the Wrath of the void, make a melee spell attack against a target within reach. On a hit, the target takes 1d10 Necrotic damage, regain and takes 1d4 of poison damage for three turns

Cantrip Upgrade. The damage increases by 1d10 when you reach levels 5 (2d10), 11 (3d10), and 17 (4d10) and poison effect last longer by one round for each time its damage is increased