Without weighing in on the vampire discussion one way or another, here's the Equal Exchange Feat of Issaries from the Sartar book:
Equal Exchange Feat
Issaries can exchange anything – goods, service, knowledge, and even magic – for something of agreed equal value. Issaries once saw two entities arguing over who had the best powers. Issaries could see that each power had its own benefits in the right situation, and showed them a way to exchange powers for a time. In this way, Issaries brought peace and understanding, and both entities each gifted him for his ingenuity.
Jeff
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