*spoiler?*
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3. the 'lift' in the upper Rapax Castle. Like you I thought it had to lead to something but it is just the lift that held the Queen's Key. When you stand on the mount with the red symbol just in front of the porticullus, the 'lift' raises up from it's nest to present you with the key. Had been facing the porticullus so I didn't see it raise up but heard the noise. Drove myself crazy trying to find out how to turn it into an elevator!
