Starcraft II: Heart of the Swarm
Zurvan (or the Ancient One) was a primal zerg of Zerus who had lived for millions of years. He was spawned before the Overmind, and lived to see the return of the Zerg Swarm to Zerus during the Second Great War. It shepherded a deinfested Sarah Kerrigan’s rebirth into the Swarm, before challenging her and subsequently being killed and having its essence absorbed by her.
As a primal zerg, Zurvan embodied the “survival of the fittest” ideals the pack leaders operated on. Zurvan was wary of the hive-minded zerg swarm, believing that losing ones individuality to a single will is a terrible fate for a strong zerg.
The ‘wings’ on Zurvan’s back stored energy, akin to the plates of the stegosaurus of pre-historic Earth.
Zurvan was younger than the power found in the first spawning pool but older than the first Overmind. It escaped being incorporated into the Swarm hive mind by Amon and remained on Zerus when the Swarm left the planet. In time, it became a pack leader and became immense both in power and physique. By the time the Swarm returned to Zerus under Sarah Kerrigan, it had been millennia since Zurvan’s last evolution.
On the advice of Dark Prelate Zeratul, Kerrigan sought out Zurvan to help her claim the power of primal zerg. The Swarm fed Zurvan quillgor to awaken it. The primal Brakk and its pack unsuccessfully attempted to halt the awakening. Zurvan instructed Kerrigan in the ways of the primal zerg and the ancient history of the zerg. Most importantly, it directed her to use the first spawning pool to transform into a primal-based human-zerg hybrid; the new form was more powerful than the old Queen of Blades.
When Kerrigan came to Zerus, she was far less powerful than Zurvan. Once a primal Kerrigan killed and absorbed the essences of the other pack leaders, she became worth consuming. She expected Zurvan’s challenge, and killed and absorbed its essence as well.