Alignment: Evil or Chaotic are both good
Base of operations: Deep within the cavernous labyrinths of the Underdark.
What are they?: A heavily militaristic society bent on destroying the bloodlines of the human species, no matter the cost of life to their own brothers.
How can they be contacted?: If you do not know already, walk away now. The sereg'wethrin do not take kindly to individuals outside their circles.