Slave Army
Concept · Stellaris 4.5.2
Slave Army in the Stellaris encyclopedia: Slave Armies require Neural Implants Technology.
Slave Army in the game's words
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Slave Armies require Neural Implants Technology.
Source: common/game_concepts (concept_slave_army) and localisation/english, Stellaris Cygnus v4.5.2 (9776).