Same problem, all of the ones mentioned are bugged for me. Also the Artefacts of the Tyrant was bugged for me as well. The Tyrant's Stride...you're supposed to talk to the statue with wit of 15 or more. I tried boosting with food and potions and stuff, even dropped a normal party member for one of the others just to boost their wit stat naturally. Still no dice. Got it to 20 before giving up.
