Indeed, not much is known about the Ghost Dance, other than the fact that performing a massive blood ritual on a power site can do big things. Not the least of the mysteries is where Daniel Howling Coyote got the knowledge for the Dance from. Even the dragons and immortal elves aren't certain (or they aren't even telling EACHOTHER). Though after reading Worlds Without End, I wonder if perhaps Thaiss(sp?), Aina's son, taught him. Apparently, he tried to do something like that before, but it didn't work because the mana levels were too low.