Shadow Hand (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Duration:||Up to 1 minute|
A dark, floating hand appears and grabs your opponent, leaching their life to aid you. As an action, you select a target and cast this spell, forcing the target to make a Constitution save against your spell save DC. If the target fails, the hand latches onto them and saps 1d4 + 1 health from them. If target succeeds, the hand disappears and they gain advantage on saves against the spell for 1 hour. The target may repeat the save each turn.
As a bonus action while this spell is in effect, you may absorb some of the life the hand has taken, up to 1d4-1. The health absorbed by the hand is lost if the target succeeds the saving throw, the spell ends, or the target dies.