Siphoning Conduit (5e Spell)
From D&D Wiki
|Casting time:||1 action|
|Range:||Touch (Aura, 30 feet)|
|Duration:||Concentration, up to 1 minute|
Cast on self or by touch on another to turn them into a conduit lasting one minute. During this time, any hostiles to the conduit within 30 feet must make a Constitution saving throw against the caster if they are in the region during any point of their turn. On a failed save, they take 4d8 necrotic damage. On a success, they instead suffer 2d8. The conduit is healed for the damage dealt and any healing at full health is added as temporary hit points.