User blog comment:Ḡwẵine Ḹٍٍkƨ Ĺiĸe Ͼềлȑềd/Where is everyone getting this Crystal Cave speculation from?/@comment-5659316-20121216201151

far fetched maybe, but there is a book about Merlin called the Crystal Cave, and they quote a poem about Merlin and the 'diamond of the day' at the opening of it...? Possible guess on fans parts due to the title of the final episodes?