Talk:Reward and Responsibility/@comment-3498155-20140323044516/@comment-24741991-20140621032856

Well, you'd be missing out on the mantle, but aside from that I don't know of any dialogue or story tidbits that are triggered by the mantle. So, no, you're not missing anything.

Besides, pretty much everything can be gotten again (or for the first time) during NG+(+++).

Like you said, you can get the mantle yourself if you sneak in at night. Just wait outside the treasury in the garden area till the guard walks out(takes about a minute so be patient). Then just go inside, get the stuff, and ferry somewhere else.

P.S.: There's one tiny thing you're gonna miss out on (at least till your next playthrough) - the Duke's reaction and dialogue is going to be different if you hand in the original Wyrmking's Ring because he can obviously open the chest with that.