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The Summoning Dark is a supernatural and "quasidemonic entity that wreaks vengeance on dwarves who have done evil in the sight of other dwarves"[1]. It first

appears in Thud!, but also appears and is referenced in Snuff and Raising Steam. During the events of Thud!, it attempts to take Commander Vimes as its champion. But it is hunted down and kicked out by The Watchman, another part of Vimes' brain. It leaves a mark on his skin, explained as an 'exit wound'. But it continues to regard Sam Vimes as its equal.

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