Fanfic III
My ongoing guilty secret (don't worry, this is the last one so far) is a mashup between Tolkien and Larry Correia's Monster Hunter series. Correia admits that his inspiration for the series was B-movie horror schlock. He's also a gun nut, so he imagined a world where the undead were moving targets! The amount of gun porn in these stories is amazing.
While the Monster Hunter series (currently at book 6!) is quite enjoyable in moderate doses, I find it a bit unbalanced that various monsters have regenerative abilities (werewolves and vampires, specifically). That's supposed to be miraculous, but the fact that only evil has it seems... wrong. Of course it adds to the heroism of the merely-human monster hunters, but also makes their victories a little implausible.
So, my take on it was that if Elves from Valinor were introduced, they would have the same ability - only they'd be on the good guys' side!
As ever, to avoid enraging the copyright gods, I'm just putting a pointer to it here.