Upon the departure of the Magna-Ge after the creation on Mundus, Akatosh arranged a meeting of the remaining Aedra outside aurbic time. The purpose of this meeting was to decide Lorkhan's punishment for tricking them into creating the mortal realm.[OOG 2]
The outcome of the Convention was to separate Lorkhan from his divine heart. Trinimac tore out Lorkhan's heart and Auri-El fastened it to an arrow and shot it into the sea where Red Mountain eventually formed.
The Heart of Lorkhan granted Mundus with a special kind of divinity and allowed Auri-El and the remaining et'Ada to leave without it becoming unraveled. The Aedra who remained either gave themselves to Mundus and became the laws of nature known as the Earthbones, the planets that surround Nirn, or became the Ehlnofey, the progenitors of man and mer.