Blood Feast

Make a bite attack against a grappled, willing, charmed, incapacitated, or restrained living creature. On a hit, deal necrotic damage, regain hit points equal to half the damage, and the target cannot regain hit points until the start of your next turn.

This power has its own stable page so it can be linked from any character, item, location, story post, bargain, curse, or future reward.