Twillight Whip

A whip 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 2d4 slashing damage. For 1 minute after hitting a target, The damage done by the spell is given to the caster as temporary hit points to the caster. 

At Higher Levels. increases by 2d4 for every level cast above 2st.