(Concerning the crystals collapsing into the hill after the battle) Have you heard of a myth about Merlin in a crystal cave and the Holy Grail? We all know what its other name is.
Yes but there are many layers there. The sa’angreal was shaped like a cup (-which I did notice earlier-). And Bao the Wyld, think about the name, it sounds like Beowulf (-looks like I should read that for more theorizing-).
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