staff of distruction - gone

[BoomBa]

Finish the "staff of distruction" quest (Im not sure about the name) in the mage tower. According to the dialogs I understood I was getting the staff but when I looked at the items screen I could not find it.

There was something about money in the dialog but I didnt really read it, there wasn't any "choice dialog".
(I was really wanted to check the staff it since Im a mage...)

Is it a bug ?
What did I do wrong ?
... and what are the staff abilities (is it worth loading the game) ?

Thanks,

Boomba.