The Pirates Of Atlantis
Endurance and Greater Powers
Typically, Greater Powers spells cost a lot of END. During a sustained battle, it’s more END than any wizard, no matter how powerful, can muster — if a wizard tried to pay all the END costs with his personal END, he’d quickly use up all his END and STUN and spend the rest of the battle unconscious. Thus, Atlantean wizards rely on an outside source of mystical “fuel” to power their spells: Orichalcum. They can draw on Orichalcum to provide the END for their spells, though this usually consumes the Orichalcum.
See Orichalcum for more information on this substance and how much END it can provide.