 When Yagdra learned that Sarah Kerrigan was transforming in a chrysalis, it attempted to halt the process permanently by sending its pack at Kerrigan's brood.In the process, Yagdra also eradicated the last remnants of Brakk's now-leaderless pack, however, it was not successful in killing the Queen of Blades before she hatched from her chrysalis.The opportunity came soon enough, however, when Kerrigan, now the Primal Queen of Blades, set out to challenge the pack leaders for control of Zerus.