Lit-Up Drow

You know something about the dark elves, the lost race, the Drow? They've adapted over millennia to an underground environment. Through melanism?

Really?

Here's the real story. Those glowing fungi that light up the Underdark? That are distilled and concentrated by the dark elves for their witch-lamps? They illuminate in reverse.

Black turns to white under that light ... orange to blue ... green to red. Early Underdark explorers glimpsed the Drow under those conditions and leapt to conclusions. But out of their element -- say, if one of them were to become all broody and alienated because his society like totally didn't respect his alignment choices, and skip town -- the Drow are pale, dark-haired ectomorphs styling the very finest in white and yellow apparel. Not that different, really, from the regular kind of high elf.

Well ... it's a good story, anyway.