Suterareta Tensei Kenja ~ Mamono No Mori De Saikyou No Dai Ma Teikoku O Tsukuriageru ~The Abandoned Reincarnated Sage ; I will forge the strongest empire in the Demon Forest! ; 捨てられた転生賢者～魔物の森で最強の大魔帝国を作り上げる～

At his death, the great sage used the new magic he developed to reincarnate into the future. However, he was deemed to be talentless and abandoned in the forest of monsters where he was picked up and raised by goblins. To repay them, he helped them evolve and taught them magic. The story of the abandoned child who will build what would be known as the great empire of monsters. (Source: Mangaupdates)