When the Ancient One asked Jolly to find the source of the mutant’s power, Jolly was a bit perplexed.  Anubis made him gather the souls of the fallen Skel’tonians, “Wouldn’t that be the source of their power?” Jolly asked.  Each mutant had to be imbued with a special crystal that would hold the soul of a fallen Skel’tonian. Jolly had to find the crystals and return them to the Ancient One so he could put them to rest, away from the torment.