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The Spool is a thread labyrinth, at the −X end of the world. It holds The Thread and is guarded by The Spinner.
Like every Worldseam dungeon it has branching paths, locked wings, keys, traps, puzzles, patrols, secret rooms and shortcuts you unlock. Doors and mechanisms are driven by the mod; there is no redstone to break, and the dungeon can't be broken into or out of.
Choose Normal, Hard or Seamless at the gate. Harder runs roll better loot.