Savage Orc

Savage Orc are considered a sub-group of Orcs, notorious for their stone-age technology, and are considered "Stupid" even in Orc "Standards". They are extremely stupid, often denying other advanced weapons such as Iron cleavers and Axes, for weapons made by Stone,Bone, and Wood. They also are most notorious for abandoning the concept of "Armor" and often are nearly naked. The only protection they wear is always body tattoo's which they believe will magically protect them from harms, although more then often this idea seems to be evident in occasions. These sub-group of Orcs mostly live in the hot and arid lands of the Badlands where the searing sun, regularly fry the already small brains of the Orcs. Only the most vicious of the Orc tribes live here, as its a fight for survival, and the land is most notorious for having many tribes of Orcs and Savage Orcs in the land fighting for tribal boundries and loot.

Source

 * Warhammer Armies: Orc and Goblins pg 34 - 38