The actual process

After warning Leo about all the risks associated with the breakthrough, Hen began explaining the process itself.

"It starts with a breakthrough potion. A volatile compound that supercharges your mana core and floods your system with raw energy. The second it hits, your mana circuits are forced to widen. And I don't mean gently," Hen said, mimicking the motion of drinking from a bottle. His face twitched in discomfort, as if haunted by memories better left buried.

"It's like shoving a hurricane through a straw," he muttered with a grim expression. "Most people scream. Some go catatonic. And those who haven't trained their mental limit? They die on the spot."

Leo nodded, slow and expressionless. "I see."