Thoth
Father was pulling mana from the void and converted all of reality for thousands and thousands of kilometers around him. Entire planets were converted into mana for him to defend himself, and trillions of lives were lost instantly.
"I just killed a little mortal, he wasn't that important, was he?" he muttered to the heavens but didn't get any response. His strength was great, but... not enough to challenge these beings.
The divine punishment of black and green lightning only lasted a few minutes, but it left completely ridiculous devastation across millions and millions of miles. It was an unparalleled level of strength. Father had to sacrifice himself to defend himself.
"A few lost millennia," he muttered as he saw that he had to use a lot of his strength. Bearing the power of a god while being a mortal was incredible, but it had a huge price to pay most of the time.