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.

--

Daily updates at 9 AM PST 

Support for bonus chapters

Level-Up Apocalypse: Surviving With The Assimilation System

Standing so close to the chainmail-clad hero, it was clear to him just how different a "HERO" was from a normal person. It was as if Ilya was born out of a children's book, both physically and in personality.

"If you wish to stand beside me, then do not fall behind!" Ilya shouted, raising his sword with readiness.

"Yeah, I know that, mate," Jasper agreed, readying himself.

An increase in temperature, carried by a wave of heat made the approaching presence unmistakable. There was no mistaking that burning glow—a blinding radiance far too bright to look at directly.

"You're still alive? It seems some humans are built with some degree of sturdiness, after all," The Sun's voice boomed as the bright figure stepped through the walls.

Unimaginable Heat