Devoke Healing

You corrupt the evocation magic of a healing spell. If a creature is casting a spell that regains hit points, for themselves or another creature, choose one of the following:

• You steal the effect of magic, halving the total amount of hit points healed by the creature. You heal 1d4 hit points.
• The creature being healed has corrupt magic enter them. They heal the full amount as normal, and then take 1d4 necrotic damage; you heal the same amount of damage taken in this way.