This collection of nasties goes all the way back to before the major Hordes as such gained their balance around S.A. 1000. Luckily its ranks have been declining since, but around S.A. 1175 it began growing in numbers and power again.
They where the main opposing factor to the 1st Alliance attempt to create The Realm and an elected High King. Their unwillingness to join or accept the cause resulted in a brief brutal open civil war, which they lost in S.A. 1149.
Its unclear how they where or are organized but they seemingly acted due to a counsel with no clear leader. Which showed in their at times inconsistent strategies, leading to their defeat and made some, Bend The Knee -an oath they later broke.
They are still out there, scheming and poking at the dying fires.