Sorry, haven't found it yet - currently at the Isle of White Vertigo and I suspect these items are back over Timmertaut way - in fact I think I may even have got a Rosewood staff there many moons ago when I first did that area, but got rid of it without knowing its functionality. However I have currently paused my game again and it may be a while before I continue. If I find a dreamcoat or rosewood staff and remember, I'll get back to you. If you find it first lemme know, I'd be curious what you find.