Primary hatchery tracks how many zerglings have died. When ability is activated, begins 30 second timer and respawns up to 10 killed zerglings at end of timer. Zerglings killed beyond the 10th count toward next usage(s) of ability. If primary hatchery is destroyed, timer continues from another available hatchery.
Zerglings will not respawn if maximum supply has been reached. Zerglings that are morphed into banelings will not respawn.
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