Heart of the Swarm Campaign- Zeras: Supreme (Part 4)

Nothing else dangerous waits after the path turns North, so follow it up the ramp to the turn Southeast once more, where you will be led to Silvan, the last pack leader.  Ever spawning banelings and occasionally spitting highly damaging acid at single target locations, Silvan is actually the least dangerous- while the banelings will regularly injure Sarah and your units, they don't deal enough damage to kill anything, particularly when you have Mend available.  The death of Silvan allows Sarah to gather the last batch of primal DNA and complete her reascension as the Queen of Blades once more.

With Silvan dead, though, Zurvan finally makes its move- erupting from the ground around Kerrigan, it prepares to consume her- or to be consumed.  This transforms the roughly circular arena in which you fought Silvan into a crescent, with the head (and main target) of Zurvan in the middle of the arc.  (Those who are familiar with another recent Blizzard game may find this amusingly or annoyingly familiar.  Coughbelialcough.)

Zurvan fights with a variety of very powerful attacks, but all are very slow, and have their areas marked (coughbelialcough).  Mend and movement will easily see this issue taken care of, and only occasional diversions will be needed for the primals spawned by the ancient Zerg.  The massive tentacle/claw limbs to the South side of the cresecent of remaining land will sometimes slap down, individually or in random groups of up to three.  Once in a while, it will hork up eggs that quickly hatch into hydralisks and roaches.  Finally, when you bring Zurvan down below about one third of its original health, it will slowly turn its head to one side or the other and belch, of all things, a massive cone of orange lightning.  While the lightning is devastatingly powerful, a single Mend will easily take care of the damage from any one tentaclaw slap, and the enemy units can be quickly and easily dealt with, so you have surprisingly little to worry about here.  Once Zurvan is destroyed and Kerrigan has absorbed its essence to add to that of the pack leaders, your work is done on this planet.