Zerg Melee Attacks Level 1
Upgrades all Zerg melee attacks.
Zerg Melee Attacks Level 2
Further upgrades all Zerg melee attacks.
Zerg Melee Attacks Level 3
Maximizes all Zerg melee attacks.
Zerg Ground Carapace Level 1
Upgrades the armor of all Zerg ground units.
Zerg Ground Carapace Level 2
Further upgrades the armor of all Zerg ground units.
Zerg Ground Carapace Level 3
Maximizes the armor of all Zerg ground units.
Enables all Zerg ground units to use the Burrow ability. Burrow allows a unit to take cover underground, rendering it unable to attack. A burrowed unit is invisible unless revealed by detectors or effects.
Increases the attack speed of Zerglings by 20%.
Increases the movement speed of Zerglings.
Buries the unit underground. Burrowed units are unable to move or attack, but they cannot be seen without detection.