We found a still living doctor and luckily for us he was in fact an oathbreaker.
How did we find out... I'll leave that to your imagination.
Anyways so we interrogated him which mostly involved having the birds peck his face moving closer and closer to his eyeballs with each peck. Pain plus the fear of impending eye pain is a surprisingly good motivator. Sadly he only got out two words before he started gagging and choked to death on his own bile. Searching the body we found that he had apparently injected himself with something during the interrogation. Crafty bastard.
Oh and those two words...
Not sure what that means.
Looks like we've hit a dead end for now.