Psychic resonance left in the Desolation by the suffering of the elves during the Invasion, takes the form of dancing, tortured elf shapes
Then - suddenly, with no perceptible change - they were there; slender, graceful sylvan figures, dancing around and through the column of mounted men and led horses. More than two score elven dancers, dressed in simple white robes, with flowers woven into their hair, laughing and singing, perfoming one of the ancient and traditional dances used to greet the spring.
Ever suspicious of the supernatural and unexpected, the party glared around, wary hands poised near hilts, ready for attack. Nothing happened, however, and they relaxed a little as they watched the dance. But as the dancers revolved, their expressions gradually changed from joy to horror and fear, and their bodies began to disintegrate. Bits of skin, flesh and muscle detached, flew off to the side and disappeared as the damned elven ghosts continue to dance, until eventually the skeletons crumbled away to dust, leaving nothing but a mocking echo of the song.
Recent discoveries have revealed that there is another, much smaller, dance of the same type in the Fens of Korvux in southern Stryre. A mysterious eldritch Piper reportedly sits at the centre of the Dance, his insane atonal melody drawing in more miserable victims and whipping those already caught to futher suffering frenzy.