I need help finding this anime
I have been searching for over a month for this anime with no luck. The only things I remember about the show are that the MC who I believe was a king has a party to hunt demons, he dies and the party is disbanded. He is later reincarnated to a changed society under a new king and new party who are stronger, and everyone looks down on the past hero party because they are now weaker. When they kill demons people take their cores to get stronger, in the past you could only have one demon core but now people can have multiple cores. I believe one core can have different levels like 1-9.
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