Should you seal the Duke in the tomb in Mina the Hollower?

Should you seal the Duke in the tomb in Mina the Hollower?

Whether you should put the Duke in the tomb in Mina the Hollower seems like a given. Putting a live person in a tightly sealed tomb generally leads to less-than-positive outcomes for them. He's awfully insistent, though, and there is something rather good in it for you. Just bear in mind there will be a small consequence later in the game.