The Red King's memories

Zarak slowly opened his eyes, and the wrath on his face vanished. Slowly his willpower returned to his mind, and the illusion of that mighty river faded away.

"That drop of water that evolved into a mighty thriving river full of life before becoming a force of nature that could drown thousands was how I visualized my personality. It is my avatar, or more accurately, my Alter-Ego, the way I see myself. 

Thanks to its existence, my body can disperse the kinetic force that lands on me, along with an incredibly potent healing power. Without my Alter-Ego, the Abyssal Demon I fought against to save you would have killed me."

At that point, Zarak stared at Cain with an extremely severe expression, making the focus on the cadet reach its peak. 

"You should never try to imitate the Alter-Ego of another person, no matter how incredible the abilities it can grant. That would twist your ego, cripple your potential, and sever your Ego Cultivation's path.