This Sword Cultivator is Somewhat Dependable - Chapter 25 - War Beast

014, a slave mercenary yearning for freedom, awakens inside the body of Sidius, a talentless boy in a realm where power reigns supreme.To save his ailing sister, he decides to sell a book inherited from his parents, unaware of its true significance. Upon touching the book, a system fuses with him and flooded him with memories of a hero.“You helped me big time system but, I really don't want to play the hero.”“I prefer playing in shadows.”Unbeknownst to him, the real manipulative being in the shadows was using him as a pawn in a grand scheme.Follow Sidius as he unravels mysteries about the universe and his identity, with a single purpose—to defy his predetermined destiny.

While the demons were rising, mankind was about to become extinct. Six temples rose and protected the last territory of mankind.

A young boy joins the temple as a knight to save his mother. During his journey full of miracles and tricks in the world where temples and demons are antagonistic to each other, will he be able to ascend to the strongest knight and inherit the sealed divine throne?

- Description from novelupdates

This is the tale of an earthling, who transmigrated as a dying third-rate god but somehow rose through the ranks, gaining followers and eventually causing the Fourth Great Apocalypse.

mc gets transmigrated to Fallout New Vegas with the merchant system. let the questionable adventure begin.