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It costs $2000 to purchase and allows any GLA unit under his control to detonate itself on command or automatically when the units/buildings die.
This upgrade has multiple possibilities of usage, one being to counter close-range fighting units as the explosion will damage units too close when the own unit is destroyed. Another usage is by combining with the rebel ambush superpower, as you can spawn rebels near enemy buildings and then force them to detonate, to effectively destroy buildings.