Star Wars Order 66
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You're a jedi fighting in the clone wars on the separatist stronghold of Mygeeto. You're launching an assault on a droid outpost when your clone commander and closest friend Commander Jade pulls out his comm and you see the Supreme Chancellor, disfigured and in a black robe. He gives the command "Execute Order 66" Commander Jade and his squad pause for a moment then raise their blasters towards you.