What's with the Farron Fortress, Which Was Supposed to Be a Beginner's Level?

"First, the terrain around the territory was transformed into a swamp. Then, toxins that could continuously corrode human adventurers were added. Finally, some [Cursed Frogs] were placed in the newly formed poison pools. This was the original defensive design of [Fran Fortress]." "Of course, the contributions of the Great Demon Aaron, known as [Pain], the greatest architect, monster expert, and mechanical designer in the Demon Realm, went far beyond this." "His design concepts for [Blighttown] and [City of Sein] are still in use today." "The modified [Cursed Frogs], [Rotting Wild Dogs], [Miracle Chest Monsters], and other monsters became popular throughout the Demon Realm." "Furthermore, there were mechanical designs such as [Doors Cannot Be Opened from This Side], [Elevators Cannot Be Operated from This Side], and [Teleportation Traps Triggered], which human adventurers deeply resented." "In conclusion, the Great Demon Aaron made significant contributions to the current demon race..."