In the Creation War (1486 DE - 8777 DE), Warvild was a master strategist on the side of the Primordials. He was focused entirely on winning, had no interest in the politics of it - undoing Creation, and refused any sort of leadership role. Even those who served under him had to get their orders from someone else, Warvild always claimed he didn't have time for the bureaucracy. Jealous of his uncanny skill at outwitting and outmaneuvering his foes, the Primordial Lords were happy with Warvild's way of thinking.
Near the end of the Creation War, with primordials beating a retreat back to Chaos, Warvild was still planning war. Refusing to leave with the rest of the mob, he remained on Bal-Kriav, hidden in a secure facility was that remained in one spot for only hours at a time. Three decades into the Demon Spawn War (8972 GE - 9493 GE), he was finally found. Luckily for the Covenant, they found him before some demon lord.
Unknown to most in the Covenant's highest circles, Warvild worked for Ares and then Asmodeus. Though many Covenant victories were credited to the genius of Ares and Asmdoeus, it is believed that Warvild probably deserved the most credit. Warvild never said anything about it. He was not interested in praise, only in the cause of defeating his opponents.
After the Demon Spawn War, Warvild disappeared along with his secret war planning bunker.