The Jusenkyo Guide
An unnamed attendant works at Jusenkyo, a legendary training ground in China famous (or infamous) for being cursed. His whole job basically comes down to one thing: stopping people from training there. He's pretty insistent about it too—warns everyone who shows up that they're asking for trouble.
The guy knows his stuff, though. He's memorized the names of hundreds of pools scattered across the area, knows exactly when each one got cursed, and can rattle off the "tragic story" behind every single one. It's like he's the living encyclopedia of Jusenkyo disasters. He's heard every excuse from martial artists convinced they can handle it, and he's seen enough people accidentally fall in to know better than anyone that the curses are no joke.
Content compiled by AnimeList.moe from publicly available sources.