The Core Crystal

After Saturo brings the man and cures his wounds the man tells him" In this world there are many other demons like that and they are trying to erase humanity so we core slayers stop them. I have my power to you so you have to slay those devils with your powers.

Saturo asks "But how can I do this" the man says "You have a green core crystal now if you train harder and kill core devil's the Core devils leave a crystal after dying you can increase your strength with the crystal. the green is the weakest and the bright white is the strongest crystal" you have to get powerful and try to save humanity I no longer have the power to do so you need to be my replacement".

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