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

Just as he landed, a pair of survivors rushed over–a sword-wielding man and a bow-carrying woman that tried to lend a hand.

"Hey, man, are you alright?--" The brunette swordsman asked, extending a hand down.

Jotham picked himself up, pushing aside the person that tried to help him as he didn't spare them so much as a glance.

Across the glass structure, Finn watched alongside Polaris and another as the divine figure rose to heights just below the world's ceiling.

The man with a white half-cape in light armor, holding a silver bow watched, "What's he doing now?"

[Name: Orion] [Designated Class: Archer] [Level: 43]

"I'm not sure–it doesn't look good," Finn answered.

Polaris watched with an excited smile, "Feel that? The air is getting electric."

Aspect of Zeus