Dyadic Prism

The Dyadic Prism is the quest item of the Destined Heroes exotic quest for Ergo Sum. Ghost hands it over in the Lost City once the quest has progressed, and it is an Exotic item that occupies an Energy weapon slot, so a free slot is needed to receive it. Holding interact at the veiled statue in the Sacrarium infuses the prism with Light and produces Ergo Sum, an Exotic Sword with random rolls.