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Unlocks after '''clearing''' Chapter 2-4 Night.
Defense Drill is a survival mode, it has a fixed cost of 3 energy and you can assign up to 4 T-Doll echelons. The objective is to survive for up to 109 149 waves, each wave will give you a certain amount of {{Icon|calibrationvoucher}}Calibration Tickets, and every 10 waves there will be a boss which rewards you a package with resources, gems, and Calibration Tickets. The rewards increase with each passing wave.
'''Wave Checkpoint Rewards:'''<div style='text-align: center;>
