System: Obtain the Marauder's Horn at the Beginning

Qin Yun traveled through time and got an unlimited prop system. The protagonist has mental problems, a hodgepodge of immortality, magic, martial arts, supernatural powers, and technology. There is no female protagonist. ... Dividing line... The insane protagonist, the mysterious system, the benevolent and great Heaven, the white-eyed wolf cultivators, magic, supernatural powers, martial arts, technology, which party can really help this decayed world? And the protagonist... Can he distinguish himself? Should he plunder the world and use the resources of this already decayed world to become a superior immortal, or should he choose to use the props in his hands and join forces with all external forces to save this already decayed world? …Who knows? Can you tell the difference? I can't tell... Is the introduction messy? The answer is yes! Hahaha! As far as the mental state of the protagonist is concerned, only a chaotic introduction can reflect the mental state of the protagonist! ………… Hehe, did the readers believe it? He really believed it! Hahahahaha! The author is a newbie, so this book may not be well written, but please give me suggestions, and the author will accept them seriously.