Nyssa was charged by Gwrien to control the reality-warping effects of the Rift. To do this Nyssa created the Archus Ring, a device enabling her to control the flows of energy. By controlling the flows the other Gods were able to manipulate them to create magical effects.

The Ring was stolen by Hesburr when she attempted to free the Lost Gods from the Rift. The Ring was in turn stolen from Hesburr by Ethyrion and given to Tammerlin, a human. Tammerlin mastered the Ring, becoming the first human mage and then returned the Ring to Nyssa.

Nyssa's control of the Rift's energy flows allows the people of Gwelith to cast spells. She is not commonly worshipped except by mages and generally remains aloof from the affairs of mortals.

Nyssa's symbol is a triangle inside a circle.

d20 Specific Rules.