Warden wakes up in a wilderness with a hole in his mind, deprived of all his memories. Lost, he found within himself an aptitude for combat and magic. 

On happenstance, he rescues a pair of youths and an entire village, pushing him into a renowned academy of mages and warriors alike to become a teacher.

Warden adventures across the divided land of Ezim, determined to unravel the mysteries of his past. However, the task becomes incredibly hazardous when his own path—the ruinous power of Void that runs through his veins—holds a connection to the Traitor Gods, who threaten to cast their shadow upon the world once more.
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Heaven's Greatest Professor

Although he had agreed with the second process so readily, he was having second thoughts after Ariha began to explain the whole process. Apparently, she was going to awaken the Radiant core first, then remove it from the suppression of the void core, and finally replace it with his heart construct.

Yes, none of this was possible with a snap of her fingers or casting a spell. She needed to perform open surgery, which meant she was going to open up his chest.

"Don't worry, you won't die," she said reassuringly, though it hardly solved the problem. "Disregarding your superior physique which will be very resilient, I'm arguably the greatest healer in the history of the known realms."

And she wasn't humble at all while claiming that.

"Only the first part of the process will be painful," she said, placing her palm on his abdomen. "For the rest of the process, you don't even have to be conscious. Now remain calm..."

Surgery