Demon's Breath

Nero had countless abilities and skills, some even too overpowered to be uncontrollable by him. Whenever Nero defeated any ancient, mythical, or celestial beings, he forged them into weapons to make the best use out of them. 

By doing that, he could get the power of the weapons and learn their abilities. He learned new abilities and skills with various weapons, and his limitless mana and power enhanced more with them.

He had sealed his abilities and skill inside his weapons and bonded them with his cores and soul to nerf himself. Although he could use them whenever he wanted, it was the best solution for Nero to control his everlasting eternal power.

One of the weapons was Harpe. Harpe was his most used weapon because it was the weakest, and he could use it without any worry.

Nero raised Harpe in the air and muttered, "O Harpe, I release you and permit you to be beyond. So be my aid and lend me my powers."