Talk:Runecraft/@comment-115.66.143.156-20161014062001/@comment-26144500-20161015035736

Actually, since it was at some point stated that, after his guildmates quit the game, Ainz did less research than what he and his friends used to do concerning new info and secrets about the game.

As such, it's possible that it was discovered and that Ainz simply didn't learn about it.

Then, there's the possibility that it was discovered even back then Ainz's guildmates were still playing, but that the ones who discovered it succeeded to keep and monopolize the secret for themselves.