I had a bogeyman emerge from Limbo back before Halloween, but I haven't followed up on it. He's inspired by a story online called Pact, by Wildbow. He'd answer to 'Mister Slash', 'The Glass-Man', 'The Glazier', and variations on that theme. If the King in Rags swore to keep him out of Limbo, he'd serve. He's in Riverside, but could move away.