 If you liked
Reikenzan: Hoshikuzu-tachi no Utage
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 ...then you might like
Tensei shitara Slime Datta Ken
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Both anime share a super strong main character who can pretty much do anything with magic. Both have a focus on empire building. Both Main Characters have strong friends that look up to the MC. Both anime are also pretty laid back, but Reikenzan has less adventure and a stronger focus on training to become better