Yagdra

"Leader of the broken pack? No!" "Is that fear, Yagdra? You do know you never had a chance, right?" "Your change means nothing! I will melt the flesh from your bones!"

- Yagdra and Kerrigan verbally spar

Yagdra was one of the primal zerg pack leaders of Zerus.

Yagdra closely resembled an ash worm in appearance, and it was considerably larger in stature than most other primal zerg. It could spit gobs of destructive acid that, according to Zurvan, burnt like fire.

Biography
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. This time, Yagdra faced Kerrigan personally. It was eventually defeated by the newly emerged queen.

Gameplay
Yagdra spits acid in two forms, a prolonged linear stream, and rapid explosive bursts strewn around the battlefield. Both show the path of the blasts before they hit.

He also has the ability to dive under the ground, leaving behind eggs in the process. They can contain either lots of small primal zerg units, or a primal ultralisk and small units. After a second he'll jump out of the ground again.