Yeah, half human, half elf. They have the same subraces as the elves, with elven traits being dominant, at least as far as appearance is concerned. Due to a strange conflict between the elven and human traits, they're actually resistant to healing magic. That being said, they're extremely good at magic, while every other trait is the average between the human and elven subtype.
They have a 0.0001% chance of turning errant while using magic. That's a Very Bad Thing.