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.
A creature you touch has the Invisble condition until the spell ends. The spell ends early immediately after the target makes an attack roll, deals damage, or casts a spell.
Using a Higher-Level Spell Slot.You can target one additional creature for each spell slot above 2.