Skull

You summon an avatar of death–a ghostly humanoid skeleton clad in a tattered black robe and carrying a spectral scythe. It appears in a space of the GM’s choice within 10 feet of you and attacks you, warning all others that you must win the battle alone. The avatar fights until you die or it drops to 0 hit points, whereupon it disappears. If anyone tries to help you, the helper summons its own avatar of death. A creature slain by an avatar of death can’t be restored to life.

Avatar of Death

Medium undead, neutral evil

Armor Class 20
Hit Points half the hit point maximum of its summoner
Speed 60 ft., fly 60 ft. (hover)

Damage Immunities necrotic, poison
Condition Immunities charmed, frightened, paralyzed, petrified, poisoned, unconscious
Senses darkvision 60 ft., truesight 60 ft., passive Perception 13
Languages all languages known to its summoner
Challenge — (0 XP)

Incorporeal Movement. The avatar can move through other creatures and objects as if they were difficult terrain. It takes 5 (1d10) force damage if it ends its turn inside an object.
Turning Immunity. The avatar is immune to features that turn undead.

Actions

Reaping Scythe. The avatar sweeps its spectral scythe through a creature within 5 feet of it, dealing 7 (1d8 + 3) slashing damage plus 4 (1d8) necrotic damage.