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Castle of Oborot--gate in southeast.
Clue is several steps from that place, you have to touch something if I remember correctly.
Here is the gate you need to blow up.
And here is where the secret switch is to close that hole that prevents you from reaching that gate.
Whiskas are most welcome. : )
You can buy it from shopkeepers who sell normal miscellaneous items, like Fiebold the Innkeeper.