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Operation Siren is a new mid- to endgame gamemode introduced to the game on December 22th, 2020. The primary benefits of playing Operation Siren are the randomnised maps that can be grinded without costing oil, granting the best gear in the game and offering the opportunity to do powerful Raid Bosses for META ships. Commanders need to be at least commander level 60 to start, with the story ending at enemy level 98, regular opponents at enemy level 114, and powerful bosses at level 128.