Xenos

Xenos is a malevolent water elemental assassin charged by an unknown patron to wipe out the remnants of the royal family of Makitau, Isla Clearstone and Kaltoka. Xenos is known for his deadly water-based attacks, his cruelty, and his tendency to retreat when confronted by stronger foes, such as Rhogar or Kleitos the Black. Xenos debuted in "Freedom!" and has since been a constant background threat for the party to deal with.