Inflict Wounds

Source: Player's Handbook

Level 1 Necromancy (Cleric)

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

A creature you touch makes a Constitution saving throw, taking 2d10 Necrotic damage on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. The damage increases by 1d10 for each spell slot level above 1.