Can someone tell me how to get to the rapax treasure room. It seems some of the map in the upper Rapax castle will not display for me. Also I have some gadgeteer items i still haven't merged can someone list all the combos for me thanks.

You can't get to the treasury room. In its description it mentions a long tube. This tube leads up to the King's quarters where you can access some of the treasure if you have the right items...

A site that give all gadgets and where to find the pieces (among other things):

http://www.geocities.com/jandrall/

If you're referring to the part behind the portcullis, that can be opened. otherwise you might refer to Flamestrykes which has gadgeteer info as well as a Rapax upper castle map.