The ARTHURIAN LEGENDS, Koopa.
Give me a sec and I'll edit my post thenFafnir would be considered a villain here, Pain. Not really a Mentor. Your Apprentice looks good though, except for the lava geyser thing. There's no guarantee that there'll be 30 geysers nearby.
That could work, but I was thinking that King Arthur has actually been placed into temporal stasis for over a thousand years by Merlin in order to preserve his life. So perhaps they're merely trying to find Arthur, and this eventually causes them to cross paths with Dracula and his apprentice. The Modred spirit thing can work, since I have a similar idea for the penultimate villain.Basically the descendant of Merlin, Merlina, finds Devin and decides to train him as her apprentice. All the while the pair search for "the next" Arthur (Another apprentice, one to King Arthur) and the vengeful spirit of Modred tries to slay them and whoever "the next" Arthur is.
Genies are the western version, I'm talking about the original, the middle eastern, those connected to fireDjinn as in genies? Sure, that can work. Just make sure to base it off something, like @Godjacob did with Merlina.