That building in the Rattkin tree where you need "something special" is where you use what you get from the Shaman after you see him.
On the fifth bough (not in the Rattkin area), there is a small turnoff that leads to two buildings. One holds a bunch of arrows and assorted other junk. The other building has a small pedestal in front of it. The pedestal is where you place the stone idol, and you generally have to be fairly close and click the idol on top of the pedestal for the door to open.
Nightowl2
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