No, this was done by Nacreous's main wizard (whose name I'm blanking on for the moment), an clever and ancient epic lvl caster who is responsible for most of the city's defenses and flesh-crafting (it was this guy's apprentice who Galthia killed by shattering the Gem of Making, outside of Akin's Throat, just before Imbindarla hit and all hell broke loose.) He lived in the mansion atop the hill of bones, and while the Ivory King looked to Soder for advice, he looked to this wizard for power and strategy.
Ironically enough, the Defenders destroyed him with nothing more than words. They told Mara's friend, who told The Clarion of Aeos, who prayed to Aeos, who learned that this "mortal" had disrupted the divine cycle of prayers, which made him angry enough to manifest on the spot and smite him down in a blaze of fiery light... which left the glowing afterimage that the Defenders are currently using to their advantage. In other words, the Defenders of Daybreak killed one of their most dangerous foes and left a way to help kill the other months before they ever learned that the foe even existed.
And no, I didn't plan it that way or anticipate this. It's the logical consequence of their actions. I blame them.
