There's No Way I'm an NPC

Li Wen spent ten utterly ordinary years after transmigrating to another world. Then, on this day, the players arrived. When the first player came to his door, Li Wen knew that his cheat had finally arrived. 【What is this? An energy bolt (click to view spell model)? Humans are still using such inferior spells after all this time? No “sure hit” (click to view rune structure), no “target tracking” (click to view rune structure). What the hell are you even doing?】 【Fireball? What's the point of a fireball without a little something extra? How about... “Extreme Cold” (click to view creation requirements)?】 【Ascetic? Get lost! I belong to the noble Dragon race (click to view racial traits).】 Huh? I can actually hear the system's behind-the-scenes information? Standing on the shoulders of giants, Li Wen brought just a tiny little bit of innovation to the world. A righteous gang-up, and you're all alone with no support? Eat a sneak attack from my siege crossbow! The world is a riot of colors, but every color is made from the three primary colors. So it's only reasonable that I combine the three elements to create a tiny little bit of magic, right? Illusion spells are useless? Ever heard of a heart made of glass shards and a body made of sword bones? A pseudo-DND setting, with players and natives exploiting each other both ways~