Ork (Warhammer 40,000)

"In the universe of Warhammer 40k, Orks are green-skinned, a side effect of their blending on a genetic level with fungi and photosynthetic organisms (essentially being enormously complex lichens). Orks have been genetically engineered for combat by their creators, the Old Ones. They are extremely strong and immensely resilient, fortunate due to their lifestyle of constant warfare and primitive medical technology and techniques. Orks live for combat, and regard fighting as the highest form of worship for their (largely indistinguishable) gods, Gork and Mork. Orks are generally indifferent as to whom they fight, being as content to fight one another as any of the various other races inhabiting the Warhammer galaxy. As such, Orks are extremely fractious."