Pathfinder Campaign - Time of Heroes
What came first? The egg, the chicken or the elf? Questions like these are what keep philosophers awake at night. Well, it keeps Dorkuss awake at least.
More importantly, it appears that elves are evil (at least some of them), and that they have no presence in the spiritual world, and are so unnatural there that the residents of that world (shadows of the real world) attack elves trespassing there on sight.