Decaying Touch

Necrotic energy springs from your hand to deliver a pulse of negative energy to a creature you try to touch. Make a melee spell attack against the target. You have advantage on the attack roll if the target is not wearing armor or has no natural armor. On a hit, the target takes 1d8 necrotic damage, and it has disadvantage on attacks that use strength or dexterity until the start of your next turn.

The spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).