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Vurm blood is used to create drahts - glowing, unique identity symbols for the ultra-conservative Dwarfs known as Deep-Downers - which are made by tattooing vurm blood under the skin. This is a powerful concept in Dwarf society. When Samuel Vimes gets his own Draht, but from a different source (the Guarding Dark), Dwarfs respond with awe and respect. Which Sam knows exactly how to exploit.