Limitless Sorcerer: I Stole the Supreme One's Vessel

Jareth, a young award-winning actor who fell from grace, awoke in Arkados, a world of magic.‎‎Arkados was a magical world of mana, but faced a world-ending apocalypse after the invasion of Oblivium, a corruptive and wild energy. Nations were destroyed. Powerful sorcerers fell. The power system shattered. Horrors awakened.‎‎Years have gone by. The world has gone through changes and is back on track. Mana has transformed and the ancient way of sorcery is no longer the path to the peak of power for Arkadians. A new way has appeared.‎‎Even after all the reformations, the building block of the arcanist, the new age sorcerers, is still mana.‎‎Luckily for Jareth, he awoke in the body of a super talented arcanist, but he has an oblivium spell source.