Due to Acedia's sacrifice, the laws that protected Ahriman's Domain from outside interference were broken.
This allowed William's Herd and King's Legion to leave the Thousand Beast Domain to come to his aid, as well as allow Conan, Elliot, and Celeste to lock on to William's and Chloee's location. Using the time that the Domain was still in an unstable state, Celeste opened the portal that allowed the Elite Warriors of Hestia Academy to join the battle.
Although Ahriman and the Dark Wraith didn't want to admit it, the advantage they had earlier had decreased by a good margin.
Ahriman's third eye locked on William's body as he gazed at him hatefully. It was all because of the Half-Elf that things were getting out of hand.