The Iron Spire. The Flawed Key Chronicles, #4

The System is broken. The only way to fix it is to hack the gods. Arlen Smith and his party-a fierce Warden, an unstable Echo Walker, a steadfast Survivor, and a newly forged Aether-construct-have held the line in the glitching ruins of Thornwick. But surviving the apocalyptic Violet Gales is no longer enough. The server is rotting from the inside out, and the System's automated defenses are preparing a hard reset that will wipe humanity from the drive permanently.
To save their reality, Arlen must carry a forbidden patch-the Compassion Protocol-to the very top of the monolithic Iron Spire. Their journey will drag them through the mechanized horrors of the Rust Jungle, the terrifying illusions of the City of Glass, and ultimately plunge them into the suffocating, forgotten depths of the Recycle Bin. Stripped of his System-granted magic in the digital graveyard, Arlen must learn the dangerous, unsanctioned art of Source Code manipulation from a ghost of the old world.
But rebooting the world comes with a terrifying cost. When the digital sky finally clears and the protective firewalls drop, Arlen must face an existential nightmare that changes everything he knows about his own existence-and the real administrators log in. The Iron Spire is the explosive second installment in The Flawed Key Chronicles. Dive back into a sprawling LitRPG/GameLit adventure where the boundaries of magic and code blur, and the only way to survive the game is to rewrite the engine.