The Abandoned Reincarnation Sage(2020)

Suterareta Tensei Kenja: Mamono no Mori de Saikyou no Daima Teikoku wo Tsukuriageru

Belamus was once a great sage with the power of reincarnation...but as all lives must pass, so did his. He reincarnated with his memories, but was suddenly abandoned as a newborn child! Luckily for him, he was adopted by the nearby goblin tribe...but this moment of kindness may mean more for both the Goblins and Belamus than either of them know!

(Source: Kodansha USA)