Speak to Lord Neverember
Speak to Celeste
Go to the Final Ritual Site
Defeat Groups of Nostura's Fores (90) - Defeat 4 groups to trigger cutscene
Confront the Cloaked Ascendancy - head through the battlefield passed the campfires to the barricade.
Click on the barricade to Confront Gyrion the Ascended.
Return to Protector's Enclave and speak to Lord Neverember