Briefly, before she was violently thrust out of her vision, Escella realized two things: One was that this Titan-creature tried and failed to remove her powers. This meant that her power had been in her all along. Instead of being granted by the gnoll's ritual, it had only been released. Evidently the Titan had believed her to be his servant, roped into service by the ritual. But she was free - her own person, with her own power.
The second was as the vision faded around her, she resisted. Even through the pain of the powerful dismissal, she looked back and as she did, the Titan's form shrunk and twisted into a fat blob of a creature. Still enormous in size, but malformed and horrible. The strange shadowy chord that she had seen before came out of the top of its head and headed off into nowhere.