The Claw are only used by the Crawler. It is believed to a natural product of evolution, but the evil Medusa could have influenced the evolution of the Crawlers, causing them to fight / appear the way they currently do.
The history of the Claws is mostly limited to creatures that evolved the Claw. No other history is known.
The Crawler are not a nation, but are tamed pets of Chaos used to wreak havoc among their enemies' troops. The Shadowrath are known to have a few set of claws, though these Claws are merely aesthetic and must be bought to be used.
- This the only form of war that is natural and not stick-made.