Plane of Twilight: A Hundred Halls LitRPG and GameLit Novel (Gamemakers Online Book 5)
War invades Gamemakers Online.

While Alex was trapped in a hospital, Professor Marzio scattered her friends across the zones, making it impossible for them to wage war. When she finally gathers her ragtag army, it pales in comparison to the enemy, but Alex isn't just fighting against this external threat, she has a time bomb ticking in her head—a cancer so large that it's affecting her in game. As time runs out, and the clash of steel echoes across the battlefield, Alex must make a terrible choice that will change the fate of the Hundred Halls forever.