I'm currently studying the Ability & Combat Toolkit, which seems to be quite promising and easy to use for adding combat to a game. It would be great to have some sort of integration for it, easier ways to sync variables, figuring out which movement scripts to use, and such.
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How you'd use AC with such an asset exactly would depend on the specifics of your game, but going by this thread, it sounds like you'd use ABC for movement, setting the AC Player's "Motion control" instead to "Manual".