He was freed upon the death of the Arbiter.
Danton Redwind made a pact with him, binding him to Danton for all intents and purposes. This allowed the Mockinglord to get close to Radiance during the Eclipse, and did not stop him from making a deal with Pietro Gori, in which the runes necessary for Binding Radiance were given to him. The cost, as it turned out, was the Republic being invaded by Malvern. Though the Mockinglord beat Danton's consciousness into submission, the fate of the two is as of yet unknown.