Reincarnates in a ditch or something, amid corpses. A commander (?) comes up asks if he's okay. He replies that he's feeling weak and that he has barely any strength. The commander tries to kill him, but the MC knew that he was a demon or something, and killed him, actually pretending that he was weakened earlier. There's this one guy who follows him for a bit depending on him for survival in the battlefield. Crystals to make a barrier that hides them from monsters (?). There's a game system in it as well... at one point, I think he saves a sword saint and his female disciple who wears a mask because she is too beautiful. He also runs through a field of demons to try and escape with someone poisoned (?). Just some random words that I vaguely recall: triagram master (?) I think it was a KR. There's cultivation in it. My memories all over the place. Sorry. Please help me identify it. I've been looking for an hour.