Power Arsenal System (Rewritten)

Karma one of the supreme immortals of the universe after ruling the whole universe for 9,000 years decided to finally be a True God and started cultivating to breakthrough a secret realm: True Nirvana, which will make him even surpass buddha himself but he failed the thunder tribulation by a trick and for some unknown reason went back to the time he was just a mere mortal but that wasn't the end he decided to be far more stronger than he was before and also get the help of the strongest system in the all existences