I actually forgot how or if they ever went over how resta and the items work, other than them tasting like a really sugary drink. I just imagined that since they live in future land where science makes magic come to life, Resta either reads the DNA of organic beings to replicate or replace missing cells or read the schematics stored where ever in a CAST to replace the materials lost in combat. So basically uses the power of extreme fission to restore what was lost in a split second. Is a pretty wild idea but that's what I roll with. Also can't explain how you wouldn't get further injured by the sudden amount of heat generated.
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