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

Drifting through countless places, memory by memory, he floated along, deeper and deeper, further and further.

Tick-tock. Tick-Tock. Tick-tock.

Descending through the disembodied layers, disconnected from it all, he was suddenly pulled–

His eyes shot open, gasping out as water spilled out from his lungs, coughing and fighting to breathe back in. Staring up above him, he found himself staring at a shattered sky, occupied by streams of water that drifted upward.

Attempting to pick himself up, he was met with immediate backlash as the mechanical armor was broken and inoperable.

He struggled, having to tear the suit from his body before finally picking himself up to his feet. With a slight wobble, he looked at the scenery ahead–one that stole the breath from his lungs.

A World Brought To Its Knees