Trying to find an old anime
I don't remember the name, only a bit of the plot that was revealed late in the story. Basically, there was a previous society that made mechs, which ended up leading to gladiator battles that drove the society to want even more brutal fights, but nobody wanted to participate because that would require them to risk their lives. So the society created gems to hold the personalities of people whom they trained to fight in the mechs for them, and when they would "die," they would just stick them in a new body and force them to fight again.
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