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528 (イディ:Re, Idi:Re) is a Relic enemy found in the Eldritch Forces Invasion, which appears after clearing all Stories of Legend sub-chapters on ★★★★ difficulty. Completing the stage will unlock 528's Legend Cat counterpart 568-1.
It has jaw-dropping health, attack power and speed, with attacks that reach past its target, but it has many knockbacks and a long backswing which makes it reasonably easy to stall. Because of its high speed, close range and instant retaliation after a knockback, it will often be uncomfortably close to the Cat Base. The main difficulty of its stage comes from the peons and ★★★★ restrictions found within it.
Despite being in mid-air at all times, it's not a Floating enemy.
Specimen No.002. Condition: Good, ancient microbes detected. Combat energy: Unmeasurable. Levitation confirmed, enemy is floating. Power output tends to increase as capacity is decreased.