Invasion: A Litrpg Apocalypse (Welcome to the Multiverse) by Sean Oswald ,

The siren has sounded and old factions of the multiverse are moving. The Earth in general and Silas in particular have become hot commodities.

The system was supposed to give Earth a probationary period but the Invasion is beginning. Silas will either form new enemies or new allies and the fate of the Earth may rest upon his decisions. With that will come new opportunities and new challenges.