User blog comment:Prof. Draco/Invent a Wesen/@comment-83.252.22.120-20130421200431

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Tengu

These Wesen are the masters of stealth and assassination. When woged, they gain black feathers on the arms and legs, their fingers become clawed, they become bald, the teeth rot and sharpen, and a large nose grows from their face. Tengu blood is said to make katanas sharper. It is even thought that a katana covered in Tengu blood once sliced through the fingernails of a Fuchsteufelwild. But Tengu blood can be used for different things as well. Some Tengu use it as poison. The poison makes the victim fall into a sleep where it will be tortured by nightmares until death eventually comes.