This plan was defeated when Morrolan journeyed to the East and confronted the manifestation of Tri'nagore. With the help of Arra and his Circle of Witches, Morrolan was able to slay Tri'nagore, using Blackwand, ending his ability to manifest on Dragaera, and thusly, his influence on the events that followed.
With the aid of the Athyra wizard Loraan, a partial portal was opened to one of the Jenoine, whose influence prevented the Orb from being able to function. This prevented the defenders of Adrilankha from being able to use Sorcery.
This part of the plot was foiled after Morrolan slew Tri'nagore, and The Necromancer was able to open a Necromantic Gate to convey herself and Sethra Lavode to the place where the Jenoine had partially manifested.
Between the two of them, Sethra and the Necromancer where then able to close the portal, restoring their ability to use sorcery.