The Immortal Realm's Arms Dealer

What was the original purpose of humanity's invention of firearms? To protect our homes and country? To compete for resources? No! It was to slaughter our own kind more efficiently! Mortals develop technology, while cultivators refine spiritual energy. These two worlds, once entirely separate, collide in spectacular fashion with the arrival of two people who transmigrated! What should a low-level cultivator do when bullied by a high-level one? Use a shotgun! In front of buckshot, all beings are equal! What should you do when attacked by endless hordes of demon beasts in a secret realm? A heavy machine gun of large caliber will teach them a lesson! Want to attack the enemy's base without making a sound? Use an electromagnetic railgun! It ignores every defense across a range of two hundred kilometers! What should you do when demons from another world invade and seize the land? Ballistic missiles are standing by! In this dazzling cultivation world, watch as Xian'er develops technology step by step and dominates the entire realm!