It's about Wizeman's page on the main site. Particularly this part:
(Official JP NiD) The ruler of Nightmare-Wizeman, a Visitor deprived of any Ideya, had begun advancing to try and extinguish Nightopia! "If all Ideya are lost, Nightopia will disappear... And my Nightmare will rule over all!'
Wizeman was the first intelligent life in the Night Dimension and the creator of Nightmare.
He created Nightmarens by using his own power. His mysterious power scares Nightmarens. But NiGHTS refuses his order, so he confines NiGHTS in an Ideya palace
It's the bit about Wizeman being a Visitor deprived of Ideya that bothers me, because I'm pretty sure that's wrong.
As far as I know, this text comes from a translation of NiD's Japanese official story, which is also on the website (here, in the section "the plot"); and the original text can be found on NiD's official website.
I'm far from being an expert in Japanese, and I don't know who made the translation, but I'm almost sure the original text says that Wizeman was destroying Nightopia by taking Ideya from Visitors, and doesn't says that he was a Visitor himself.
I know that it''s not really important but I just wanted to point that out. But feel free to correct me if you think I'm wrong.