Night Babylon is the fourth area visited in Sonic Battle. Central City's neon-lit nightlife district, Night Babylon is full of stores, bars and casinos, foremost amongst them being Rouge's very own den of iniquity, Club "Rouge". The area also hides a not-so-cunningly-disguised entrance to one of Eggman's underground bases, Gimme Shelter. It does not, however, have the slightest thing to do with Babylon Garden.
First accessed in Rouge's episode, Night Babylon is where the bat brings Shadow after saving him from the Guard Robo in Gimme Shelter—perhaps the thief's only act of charity ever. The Ultimate Lifeform then spends most of the game tucked away inside Club Rouge, dreaming fevered dreams and babbling in his sleep. Rouge also retreats here to lay low after stealing Emerl from Amy in Emerald Town, and trains the robot up intending to turn him into an all-purpose thieving aid.
Due to the indirect nature of Sonic Battle's stages, other characters return to Night Babylon in their own episodes. Knuckles' story sees him and Emerl dismantle a veritable army of E-121 Phi robots and Guard Robos amidst Night Babylon's streets. Amy also (reluctantly) enters what she calls the "spooky" district when Emerl detects Emerald Shards here.
Club "Rouge" is the only arena in Night Babylon. The arena itself is a medium-sized, square arena, with wall-like segments enclosing a central area with a raised platform.
Despite its name, Club "Rouge" is not strictly confined to Rouge's personal establishment; all the places in Night Babylon have the same fighting arena. Rouge herself uses this arena to train Emerl during Shadow and Emerl's episodes.
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