So got to play a few scenarios today for the first time. We had a little confusion regarding Omnitron and his drone when Omni gets incapacitated.
Are the drones removed from the board or do they stay?
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Drones (and other summoned targets/markers) leave play when the power that summons them leaves play.
Scenario powers do not leave play when the villain is incapacitated, so the drones do not leave play either.