If I remember correctly, Celedaen states he receieved the information directly from the King of Worms. However He never stated (iirc) what he did to achieve this information. Wouldn't it be interesting if he communed with the ideal masters by mistake, and that tossing his own phylactery when it was over would've achieved the same result? Hummm Just a thought. Incidentally, we never get to see if Celedaen's method was confirmed. According to his information it was, but who's to say it was accurate? We didn't exactly let him confirm it ;)