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The positions your T-Dolls of each echelon take in battle setup according to your preferences. A large amount of your success and effectiveness in battle depends on how your formation is setup due to the tile buffs your T-Doll provide, their effectiveness in said positions according to their roles and a large number of other factors including the enemies they’ll face. Each formation has it’s pros and cons depending on the fights you’ll take and preparation is just as or more important than the actual battle.
To help, a guide by Brassy and Jetroyz about formations can help you determine which one to use. You can find it on the right of this entry. (Take note that while many of the concepts from the guide still apply, some information might be not updated such as RoF formula or Targeting, be aware.)