Absorb Damage. You are immune to Necrotic damage. If you are the target of an attack that would deal Necrotic damage to you, you instead regain hit points equal to the Necrotic damage dealt.
Damage Vulnerabilities. You are vulnerable to Radiant damage.
Sunlight Sensitivity. While in sunlight, you have disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.
Undead Nature. You don't require air, drink, food, or sleep.