A Forbidden-Spell Mage Opens a General Store in Gotham [Western Crossover]

[Now posting, updates follow the rankings. I just couldn't write the previous idea after all, qwq. Sorry!] Miss is a naturally gifted forbidden-spell caster. One day, he gets bound to the Two-World General Store. The System is brimming with enthusiasm: “Earth and the Western Fantasy world are about to merge. It's time to get to work!” Miss hesitates. “Wait...” But he's a weak and pitiful mage who only knows healing spells! Bats is certain that something terrifying has happened to the world. It's definitely not just his usual paranoia. Because he really does step into thin air and fall into another world. Bats, badly wounded, sees a pack of gnolls with his own eyes. “… Has The Lord of the Rings become real?” The gnolls are about to attack. At this critical moment, a dusty youth carrying a huge bundle suddenly appears. The moment he sees Bats, his eyes light up as if he's found a godsend, his only lifeline. “Bro! How about a deal?” Miss almost drops to his knees. “I'll heal you, and you buy something from me... Please, bro.” The System is a real pain in the ass. Its slogan sounds great: start with a Gotham general store. The Nine Hells, frozen tundra, and dragon lairs are all his suppliers. Staves, alchemical devices, even dragons and elves for resale... He's got every kind of product. It's billed as a real-life looter shooter with extraction. But the problem is, where are all the good customers? Miss has finally managed to find a customer, and decides to save him right away, force a sale, and latch onto the guy for dear life! Is healing magic from another world really this powerful? Bats wants to refuse warily. But the youth suddenly raises his hand. Terrifying holy light blooms in his palm, and intricate runes spiral up from beneath their feet, forming an imposing ritual altar in the blink of an eye... [Forbidden spell, Ninth-Circle Greater Healing!] Bats squints. “That's bright.” The System, which knows its stuff, is already stunned. He opens with a Ninth-Circle forbidden spell? Wait, didn't you say you only knew healing? You use forbidden spells like basic attacks! The general store's products have miraculous effects. [Holy White Armor] Bats puts it on and instantly becomes a holy white knight, with his combat strength soaring. The price: the Dark Knight can no longer lurk in the shadows, since his gear is far too dazzling and bright. [Druid's Staff] Peter turns into a real jumping spider and lets out a shocked scream. [Monk's Gauntlets] The elderly butler is ambushed. But he spins around and smashes an armored vehicle with one punch. Everyone else stares in shock. “Holy crap!” Miss's products get rave reviews, and business keeps booming. He helps the superheroes deal with the abyssal rifts. He takes kobold lairs, lich towers, dragon nests, and floating city ruins... and turns them all into the general store's “suppliers” and “factories.” Since he can't keep up with everything, he also casually hires a metal controller, a speedster... and other strange individuals as shop assistants. His days are peaceful and ordinary, but blissfully pleasant. Until one day An alien warship invades Earth, declaring that it will conquer the planet and enslave humanity within days. Miss is furious. “Is it really that low to interrupt someone's business?” The next second, monster tribes pour out at his command. The setting sun is as red as blood, its light spilling across the earth. The kobolds charge forward without hesitation. A vast army of gnolls stands ready. Orcs brandish axes as tall as they are, while terrifying dragons spread their wings. The monsters thirst for battle and blood. The forbidden-spell caster simply floats in midair and says coolly: “Let the battle begin. I want rivers of blood.” The superheroes: !!! The aliens, already dumbfounded: “Ahhh! Sorry to bother you!!” 1. Inspired by Baldur's Gate and the DnD setting. 2. A brainless power fantasy, a light novel with no logic. OOC warning! 3. Includes the superheroes adventuring together and protecting the protagonist, plus a found-family dynamic. Guaranteed wish fulfillment, with a super Gary Stu. Message: Make money, run a business, and reap the rewards of hard work!