The Cursed Soldier of Adversity

Trevor has spent three years as a military commander, battling in a war that seems endless. But when a supernatural message invades his reality-
[Congratulations! You've awakened.
Main Quest: Survive without using the system.
Failure: Transmigration to a new timeline.]
-he's thrust into a situation straight out of a fantasy. At first, he thinks it's a strange blessing, but the arrival of a monstrous tower in a neighboring country shatters his illusion. As humanity faces a horrifying new enemy, Trevor must rely on the mysterious system to survive, even as it pushes him toward inevitable failure. When his platoon falls, and the system declares his defeat, Trevor is transported to a new world. Now, in an unfamiliar realm, he is determined to uncover the truth behind the system, the towers, and the mastermind pulling the strings.