Thank you for playing! We can't take credit on Trogdor... all credits to the creators :)
And yes, that is a roadblock for you: SILENCE (which does not allow MAGICKS or EVIL SPEECH) and SAP on ATTACK (which does not allow you to use ATTACK), thus rendering you without attack options. But doesn't it sound like something a player would do to a final boss? Or any enemy for that matter lol
Debuffs in general have a 25% chance per turn to be removed, or are removed after 3 turns passed.
The sap only returns when the Thief gets hit.
Hope you don't die to a Limit in hard mode :)