"Ghost" to steal everypony's kidneys or liver. (Except Akasha, who is protected by her element.) Playing a mouth organ.
All what I touch turns to gold; through still air streaking, yet it can't often be sold. If I am broken, I _stop_ leaking.
Though I live in darkness, I am a faithful bloke. A drunken master often sends me to the gallows, but I fear most the green-capped assassin lurking under elder oak. If I perish, my master follows.