[andai]

There is a German Wikipedia article[0] and it's mostly readable through Google Translate[1] (I made a static snapshot).

[0] - https://de.wikipedia.org/wiki/Graal_Online

[1] - https://archive.ph/77B1o

[ant6n]

In typical wiki and also typical German fashion, the article is very technical, focuses on things like technical requirements rather than the story, descriptions or definitions.