One late evening, King Anduin summoned High Exarch Turalyon and King Genn Greymane to the Cathedral of Light and reunited them with Alonsus Faol, officially dressed as he was in life as an archbishop, in a last-ditch effort to convince them of the righteousness of his cause. Genn was outraged that Anduin would traumatize them by using an abominable version of their old friend in order to make a point. He accused Alonsus of manipulating the king, but Faol retorted to Greymane that his hatred of him stems from fear; fear that if he acknowledges the Forsaken as people, then he would also be acknowledging that his son died for nothing. Though Genn was about to assault Faol in fury, Turalyon stopped him as he would not permit violence in a sacred place. Faol tried to convince Genn his rage and pain was prohibiting him from understanding a truth that could change his perceptions, but Genn wanted to cling to hatred and sorrow as it was what fueled him to fight. Faol sympathized but when he asked if he would still hate the Forsaken if Faol came to him with a Forsaken Liam, Genn was shaken to the core. Unable to face the truth, Genn howled in fury and fled the Cathedral. After Genn left the cathedral in rage, Turalyon told Faol that he blasphemed what was once a good man and had stolen his form, and if there was anything left of his old friend Turalyon would kill him in mercy. But when Faol told Turalyon to look for the Light within him, Turalyon did not strike; when he did indeed find it, with tearful joy he knelt in front of the archbishop who gave him a blessing. Overjoyed Turalyon changed his mind about the Gathering and immediately admitting his views had been wrong, offered his help to Anduin.
Alonsus and his fellow priests attended the Gathering to supervise the event and to provide the participants with their blessings. The Gathering ended in tragedy, however, and his friend Calia was killed on the field by Sylvanas. He took her corpse back to Netherlight Temple and regretted authorizing her participation in the event. Miraculously, Calia's body was not decomposing. With Saa'ra's guidance, Saa'ra, Alonsus, and Anduin raised Calia back to life with the power of the Light, but as an undead.