DelzGB

Within the virtual world of “Avalon Online”, Finn, or otherwise known as “Echo” within the game, was one of its greatest players. After logging off from a long session, however, he notices something awry outside of his apartment. 
The streets were flooded with chaos, screams echo through the night, and hell is loot loose. Monsters from Avalon Online are running through the streets, wrecking havoc. In the midst of this hellish awakening, Finn is greeted with the one gift bestowed to humanity in this dark hour:
[...Assessing life experience…] 
[Assessment Complete] 
[Name: Finn Thorne] 
[Age: 20] 
[Designated Class: Assassin] 
[Starting Level: 5] 
[A [Legacy System] has been bestowed to you for your accomplishments within Avalon.]
[Assimilation System Awakened.] 
In this twisted turn, as the world as it was once known is gone with the arrival of magic and monsters, the remnants of humanity must level up if they wish to survive. 
Finn is left in this dark, hopeless apocalypse, using his own experience from Avalon Online to best survive what seems to be an impossible task.

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Level-Up Apocalypse: Surviving With The Assimilation System

Somehow, the stature of Ilya matched that of the gargantuan man-shaped Sun. Even so, it was obvious to Jasper that the blade wielded by the heroic warrior didn't reach the blazing tyrant.

Ilya roared as he wildly swung his blade, stirring up a storm with his might alone all while the Sun roared as well, only with laughter. Each time the silver blade made contact with the Sun, it merely moved through its non-physical body, pushing its flaming skin around.

"Keep trying! Try harder, and perhaps give me a challenge!" The Sun welcomed the assault, responding with wild releases of burning energy in all directions.

There was nothing the blade could do, no matter all the strength behind it. Such vicious swings only resulted in the Sun grabbing a hold of the warrior, lifting Ilya off his feet.

A Man; A Knight