"We are spirits of people who have accomplished great tasks in history and legend. As a result the Holy Grail will be able to allow a mage to summon one of us to fight with them to win this Grail. We will be given abilities based on what we accomplished in life as well as great durability and strength." He considered it a moment or so before adding. "We are very much like powerful beings save for the fact that in our world we must be bound to a mage for we cannot produce the mana we need to live."