Merchant Bexhanar or mage Markunthar were supposed to give you a hint - but never did in my case. Barnie helped me <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" /> - I wrote down the combo in my post above - you just have to press your mouse and drag it after the word "spoiler".
Kiya
There is a note in a book one level higher at the merchant - but this combo in there is for another riddle. So, if anyone finds a note, or can tell me, where I missed the point, I'd be very grateful.