The Binding of Isaac: Rebirth Wiki recently forked to wiki.gg. https://bindingofisaacrebirth.fandom.com/ -> https://bindingofisaacrebirth.wiki.gg/

https://homestuck-and-mspa-music.fandom.com/wiki/Crystalmethequins -> https://hsmusic.wiki/track/crystalmethequins/

This one might be weird/impossible to implement automatic redirects for due hsmusic.wiki's lack of a search function and significantly different url scheme. Though I think in this case just putting the user on the home page would be acceptable due to how well organized hsmusic.wiki is.