skekGra wouldn't remember. GraGoh hadn't been directly involved in the experimentation - the UrSkek was more of an artist than a scientist or a leader.

"The Crystal has to be healed, and the Mystics and Skeksis become one again. That's the only way things can be made right again in Thra. A Gelfling must do repair the crystal and fix what was broken. The Skeksis and the Darkening have to be stopped."