Prince Wuscfrea nods, and hands you your glaive.
"Aye, indeed - there are some in the safe room - which..." He dashes back behind the throne and kicks the back of it, then looks up and grins.
"...I have found!"
After a few seconds, the throne slides forward, and you see a small opening with a ladder leading down. Wuscfrea climbs down, and waves you forward.
Spoiler: Spot DC 20
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You're confident that you're alone in the room now.
--
Hidden Tunnel
The ladder takes you some twenty or thirty feet down, into a dark stone tunnel. Prince Wuscfrea takes a small pendant from his pocket and mumbles a few words - and it begins to glow brightly, like a torch. You are standing in a hallway that extends past your vision in two directions - south, towards the courtyard, and north towards the city. You hear the throne slide back into place above you with a loud
clack, and the prince walks north.
Soon, the light reveals a heavy stone door, and Wuscfrea places his pendant against the stone - which slides into the wall without a sound. As soon as you've all entered, the door closes, and magical torches spring to life.
--
Safe Room
This room is similar to the one you found Prince Wuscfrea in at the feast hall, if perhaps a little bigger. There is a reading area, with a bookshelf and an armchair; a small mattress and some sheets; a chamber pot; and a chest of medicine and potions, from which the prince retrieves two vials of a milky-white liquid.
"Here, Alphonse - I'm afraid it's all we've got left down here. I should have this room stocked again."
He sits in the armchair, and puts a finger to his lip.
"I wish I could be some help here - but I don't know anything about our attackers. Holtti's much better at this sort of thing. I hope he's made it to his office and gotten some healing."