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.
Many zerg ground units may burrow, become invisible and may be revealed primarily by detectors, and may not move or attack. Exceptions are the roach, which may move while burrowed, the infestor, which may move and cast Infested Terran, and the baneling, which can detonate while burrowed.
Some units can unburrow via autocast, causing them to emerge and attack when an enemy moves into range.
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.
The ultralisk and ultralisk cavern are exclusive to Kerrigan in Co-op Missions. Additional upgrades for the ultralisk become available when Kerrigan reaches Level 13. Kerrigan's ultralisks automatically upgrade into Torrasque when she reaches Level 14.