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

"Show me what you feel when everything you care for is taken away."

He found himself back in the throne room lit by silver candles. It took him a moment to come to, feeling an odd sensation at his feet as he looked down.

The warmth he found was a slick, scarlet substance that plentifully pooled at the steps to the throne.

As he looked around him, his stomach dropped as his blood ran cold; the bodies of his friends were twisted and eviscerated.

The knight was left covered in holes, lifelessly slumped against a kneeling statue. Just behind Jasper was the bard, who he looked to have tried to shield, though Nova shared the same fate, laying in a pool of blood.

Just a few steps ahead of him, he found Charlotte laid on the steps, covered in lacerations and bloodied beyond survivability.

Deceitful Truth