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

It felt as if his organs had been thoroughly squeezed and twisted, a sensation that left his entire body aching.

The helmet reformed itself around his head as a sense of relief filled his body as small needles injected him from within the suit. It immediately eased the pain, washing away the desperate aching as he straightened himself.

'Alright…Can't get caught by that again. It could be a death sentence,' he resolved, looking across the humming crater at the entity.

A simple breath left his lips as he watched the distorted scenery shift once more, filling with a hopeless sight; dozens of perfect meteors were summoned, shooting towards his position. It was distinctly different from facing somebody like Sirius–a tried and true "god."

System Amplification