Arrow of Dusk

A bolt of shadow springs from your hand and toward a creature within range, draining vitality where it strikes. Make a ranged spell attack against the target. On a hit, it takes 1d8 piercing damage. If you score a critical hit, triple the damage. If this damage would reduce a creature to 0 hit points or fewer, it is rendered unconscious, but stable.

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