Skull

CardLLKp. 532014

You summon an avatar of death—a mechanical skeleton (use bone naga statistics) clad in a tattered black robe. It appears in a space of the DM'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.

Raw data
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  "name": "Skull",
  "page": 53,
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  "source": "LLK",
  "entries": [
    "You summon an avatar of death—a mechanical skeleton (use bone naga statistics) clad in a tattered black robe. It appears in a space of the DM'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."
  ]
}