Elder blue dragon
Fulminorax is an elder blue dragon who achieved great power in Thay for his wizardry. Szass Tam sent him to Neverwinter to aid Valindra Shadowmantle’s efforts. He was ultimately manipulated by Klauth and the Northern Five, who gave him the opportunity to prove his worth by attacking a Netherese expedition to Ellyn’taal to find Ioulaum, the first of the ancient Netherese archmagi. The Northern Five betrayed the Netherese they led to the ancient illithid city and helped Fulminorax kill them and “the Oracle of Ellyn’taal,” the undead elder brain that Ioulaum had become. This victory convinced Szass Tam to put Fulminorax in charge of Thay’s expedition in Neverwinter Wood, and even grant his request for Valindra’s phylactery, so that he could keep her under control. This turned out to be precisely the point of the plan that Klauth and the Northern Five had concocted. Once Fulminorax was in place, Klauth attacked the Dread Ring, destroying it and slaying Fulminorax. This was a crushing blow for Thay, enough for Szass Tam to withdraw his forces from the Sword Coast on concentrate on the war with Netheril closer to home.