The ultralisk remains the heavy assault beast for zerg forces. The ultralisk may now burrow, although it takes longer to burrow than smaller zerg units.
Ultralisks are fast and deal high damage to armored units (Wings of Liberty only). They also deal splash damage which makes them effective against groups of low HP units, such as zerglings and zealots. They are vulnerable to immortals, siege tanks, and dark templar. They are immune to stun and mind control effects.
Captive ultralisks are featured as a number of destructable doodads. "Piercing the Shroud" has a captive ultralisk; when destroyed it releases broodlings. A similar unselectable ultralisk is found in a hidden place in "Ghost of a Chance". Though it maintains its frenzied attribute it can still be captured using the hive mind emulator.
Heart of the Swarm
In the Heart of the Swarm campaign, the ultralisk can be evolved into either the Noxious or Torrasque strain after the necessary evolution mission is completed.
It is also significantly less powerful offensively compared to the multiplayer version, doing only 25 damage per attack against its main target and 5 damage to secondary targets.
Upgrades
Burrow Charge
Ultralisk burrows and charges towards target point. On eruption, knocks enemies back and stuns them for 2 seconds. Can be autocast.
Ultralisk, large muscular surface area. Able to vibrate billions of subdermal muscles, break apart terrain, burrow into ground. Possible to mutate muscular system, amplify vibration resonance. Allow ultralisk to dive into ground, charge enemy. Exploit misconceptions of solid terrain.
Ultralisk recovers 40% of damage inflicted to enemies.
Kaiser blades extremely effective. Monofilament edge tears through materials. Flesh, bone, armor. Significant carnage. Can utilize, turn into asset. Can alter carapace surface. Allow assimilation of usable matter from fluids, wreckage. Will become fuel for immediate tissue regeneration.
Significant alteration, monarch blades. Tissues of kaiser blades reconfigured on microscopic scale. New structure prevents momentum loss. Blades cleave multiple enemies with same strength as striking single foe.