Death knight

When a paladin that falls from grace dies without seeking atonement, dark powers can transform the once-mortal knight into a hateful undead creature. A death knight is a skeletal warrior clad in fearsome plate armor. Beneath its helmet, one can see the knight’s skull with malevolent pinpoints of light burning in its eye sockets.

You gain the following abilities

• You gain Darkvision up to 60ft.
• Your Strength and constitution scores increase by 2, and your charisma score increases by 1, up to a maximum of 20.
• You gain advantage on saving throws against spells and other magical effects.
• You gain an immunity to necrotic and poison damage
• You become immune to the frightened and poisoned conditions
• You gain the ability to cast Hellfire orb once a day
• You do not require food, drink, air or sleep.
• You count as undead for any spells and effects that affect undead.

A death knight retains the ability to cast divine spells. However, no death knight can use its magic to heal. A death knight can arise anew even after it has been destroyed. Only when it atones for a life of wickedness or finds redemption can it finally escape its undead purgatory and truly perish.