Geassi binds the draiocht of the worlds and the bright Sidhe keep the draiocht in balance. But Moragacht the witch defies the Sidhe by waking the ancient earth gods and practising stone magic, which disturbs Faery and its delicate balances. But to work magic requires giving something to the powers from where the magic comes, and the greater the magic, the greater the gift must be. Moragacht draws her magic from the earth powers, the banished gods, but her real desire is to control Faery, and Nuallan is her gift in exchange for this sorcery. However, the exchange cannot happen until Nuallan consents, until he accepts and worships the stone gods.