 After Duran revealed he had been breeding Protoss-Zerg hybrids for a greater master, Zeratul set out to find Duran's master and his plan, which encompasses all of his activities in the three installments of "StarCraft II".In Wings of Liberty, he gives Jim Raynor a crystal with his memories to emphasize the importance of the latter's mission to de-infest Kerrigan.In Heart of the Swarm, he guides Kerrigan to Zerus, the original home of the Zerg, and encourages her to re-infest herself so she can stop Amon, a fallen Xel'naga who is revealed to be the master of Duran and seeks to destroy all life in the Korpulu Sector and remold it in his image.