Alen_Tanor
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I had a weird thought that's so out of left field that it goes back to making sense... What if in someway Merlin is Lilia, and is looking after Cain indirectly... I kinda doubt it but at the same time I could see it...
Obviously not Lilia prime that is, as Lilia would erase the spell without much a thought, but maybe a Lilia who reset herself in a sense...
Merlin possibly bitten by Arad and converted to a Vampire?