 Taking more than half the Dominion fleet, Valerian joins forces with Raynor's Raiders and lays siege to the Zerg stronghold of Char, as part of an effort to prove to the Dominion (and to his father) that he will be worthy to take the emperor's crown after Arcturus.Ultimately, the mission succeeds in de-infesting Kerrigan, but in the aftermath of the battle a disagreement between Arcturus and Valerian over Kerrigan's fate sparks an armed civil war between the Emperor and Prince, leading Valerian and a faction of the Dominion's armed forces loyal to him to seek shelter with Raynor's Raiders.In "Heart of the Swarm", Valerian helps Raynor and his Raiders escape into the Umojan Protectorate, where Kerrigan undergoes extensive testing in a research lab.