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[dev1133] Battle Regimens

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* The following revision, planned for patch 1.19, is still in development, and therefore subject to change.

Patch 1.19 will see the suspension of Battle Regimens.

We are currently in the process of rebuilding the framework of the battle system, which involves large-scale revisions to the enemy claiming and linking systems as well as damage calculations. Unfortunately, these changes will render Battle Regimens unusable, and so we have decided to suspend their use in patch 1.19. We aim to have a new and optimized regimen system in place after the adjustments to battle classes have been completed alongside the launch of the job system.

* The reimplementation schedule is yet to be determined.