Board Thread:Show-Related Questions and Answers/@comment-26116863-20151117024202/@comment-6175354-20151201151854

Eskaver wrote: It's a good theory, but it simply lacks the name. The Dark One is the HG user that gives into Darkness, while Merlin is the HG user that didn't. From how I understood the theory, the magic granted from the Holy Grail is Dark by nature. Merlin found a way to harness the Darkness for good, which is why he was deemed worthy to drink from the cup. It also explains how Merlin was able to forge his apprentice's wand, before the Dark One ever came into existance.