These giant spider-like beings lived only underground, very peacefully in caves and abandoned mines, until discovered by the orcs, who instantly recognized their true potential. The orcs bred and trained them to become the cruel fighting beasts of today.
I was never brave enough to watch them closely, but it seems they have no eyes nor ears. How is it then possible they do not loose the orientation even in the toughest battle? They must have an unknown sense that evolved in the darkness of forgotten caves.
Dexeter, from safe distance