Yun-Yammka, the Slayer, was the god of war of the Yuuzhan Vong. Yun-Yammka was worshiped by the warrior caste, and was the one who taught the Yuuzhan Vong the importance of blood sacrifices. Every appeal to him was accompanied with a death sacrifice, except the morning and evening prayers. Despite Yun-Yammka's importance in Yuuzhan Vong culture, he was not one of their native deities. The priest caste created him when the Yuuzhan Vong became warlike. He was served by the Order of Yun-Yammka. Onimi believed that the spirit of Yun-Yammka dwelt in Luke Skywalker.