Talk:Duke's Demesne/@comment-69.9.92.179-20130830033303/@comment-69.199.101.153-20130830132639

Answers can be found on the http://dragonsdogma.wikia.com/wiki/Treasury page.

The big chest you are referring to contains the Paladin's Mantle which can only be opened with the Wyrmking's Ring.

If the ring is given back to Aldous, the Duke will use the ring to open your chest; however your chance at acquiring will be lost.

The alternative solution would be to give a forgery to Aldous, in which the Duke will try to use the ring to open the chest. However, because it is fake, the ring will not work and the chest will remain closed.

This solution will allow you to keep the Ring, but you'll miss out on the Paladin's Mantle. Luckily you can easily "break-in" into the Treasury and open the chest yourself provided you have the actual ring.