Cataphracts, surviving in a world full of mods

{A slightly magical, self-created world with a large number of original mods by the author}
Once transported to a medieval battlefield, one is immediately surrounded by enemy forces, facing a near-certain death.
But that's okay. At this crucial moment, a magical interface appeared before my eyes. Presumably, I'll be able to unlock easy mode and easily reach the pinnacle of life. It will definitely be of great help, right? ...
After surviving a near-death experience, Xu Ning realized—this thing's only function was a display screen! He'd have to rely on himself from now on…
………………
He found himself transported to a chaotic battlefield in full armored cavalry gear, but that didn't matter; he had survived. Mount & Blade II was just a normal medieval world, he thought, "I can survive..." That was his thought until he saw those long-eared elves...
(The protagonist's initial appearance is inspired by the elite armored cavalry in Mount & Blade II: Bannerlord. This is a story about fighting against alien races and saving the world, starting with armored cavalry, and it has some fantasy elements.)