Flames of Enlightenment
From The Stargate Omnipedia
A great chasm of fire where many, if not all, of the Ori appear to reside in their ascended state. To gaze upon the Flames is a gift and reward to loyal followers. Often when summoned to the Flames one is transformed into a Prior -- suggesting that they are a source or conduit of the Ori's power.
KEY EPISODE
Origin - The Doci invites Daniel to witness the Flames of Enlightenment where he has his first encounter with the Ori.