Guarding the Border Alone with a Dungeon Interface

He transmigrates to Middle-earth with a single-player, heavily modified version of the Dungeon Fighter game interface. A powerful figure gives him one last order: guard the frontier, wait for reinforcements, and keep the Abyssal Hell from invading! Zhao Xu is panicking. He's the only person at the entire frontier! At least he has the golden finger every transmigrator needs. First, let's see what this Dungeon interface can do. Pet gacha: a Fate Gundam? A Twelve-Winged Holy Demon Angel? A Seven-Winged Divine Dragon King? This mod is a little over the top. Mastery of every class's skills? I only wanted to train as a Great Red God. Summon Apostles? Can I use Hilder to fight Hilder? What about resurrection coins? Why isn't there a single one? Does the single-player version of Dungeon Fighter not need resurrection coins? But I'm in another world, hello! Huh, what's this “gentleman's patch” feature for? Let's try it... Three hundred years later, a ragged human coalition retreats into Jingfang City at the frontier. Zhao Xu is overjoyed. Reinforcements have finally arrived! Three hundred years! Do you know what I've been through for the past three hundred years? What? I've been holding the frontier just fine on my own, and you all got defeated? The Abyssal Hell has invaded and all of Middle-earth has fallen? Don't panic. Actually, the Abyssal World... is almost mine for the taking too!!