It fits like a glove and the lock opens when you twist it

Inside the cell you find the skeletal remains of a dwarf in rusted plate armor.

Flint walks into the room with Mirage. 

"Huh, why would he be locked in here with plate armor? If he was a prisoner, shouldn't he be in like rags or something?"

Mirage agrees, but can't deny that a leg bone is a leg bone and grabs the dwarven skeleton's leg to play fetch with. This makes Flint smile. 

As Mirage tugs at the leg, a small silk purse falls out of the corpse

Slate

Slate eyes the rusted plate armor, "It's too bad the armor is so deteriorated..." she then eyes the rest of the interior, "Is this a jail?"

Iroona approaches the room, now that she's reasonably sure it won't kill her. She coos over the armor, slipping into the room and examining it. "It is rusted, but it's dwarven work, I bet."

Investigation to see if there's anything interesting about the armor. Besides the silk purse that she will pick up if nobody else has done so: 12

The armor is rusted beyond use

Disappointed, Iroona will stand back up and open the purse.

Iroona upends the purse in to her hand and finds 8 pp and a big heavy shiny Dwarven key.  In the background you hear a sound...

"Oh!" She hands off the purse and the coins to Slate or Flint, whichever one reaches for them first, and examines the key. Remember, she can read any language now!

Flint grabs the bag off Kora, looks inside and then hands the bag to Slate. Flint looks at the new shiny key and ponders about all the wonders it will open for him...them. For them. He grabs (?retcon?) the key out of her Iroona's hand if she'll let him. "C'mon Mirage. We got a door to open!"

"Does anyone remember where there was a locked door at? Were there any doors locked? What day is it when you can..." Flint walks away mumbling to himself. 

OOC > So, Flint takes the key out of Iroona's hands? Not that I'd expect any different! I'm happy to retcon that Flint got the bag first, since Iroona was looking at the armor, and I did say she'd take the bag if nobody else had got it first.

Iroona sighs as Flint mumbles off with the key. She comes out of the cell into the hallway. "Where next?"

((OOG Sorry, I read that wrong lol :P I retconned it for ya...sorry buddy! :P )) 

She lets him, sort of bemusedly.

"Oh! Yes, back by where those horrible creatures attacked us, where I was going to climb up and look through their little cave, and then Slate went up and dug through their... um, offal. There was a Dwarven door there!" Iroona sways a little at the memory of the gricks.

"Lead the way, I-R-O-...um...ah...N...?" Flint says as he carries the key out in front of him proudly swinging it round like its a two-handed sword. The sounds he makes are like a hum, but a strange one that no one has ever heard before. "Wom. wom wom. Vwom. Wom wom."

So the merry band of miscreants tiptoe past the sleeping rock creature and back to the large cavern where they once again see the iron door...

Cut into the cavern wall is a small but strong-looking door of iron plates, about five feet tall and four feet wide. Heavy rivets stud its surface, and a tarnished silver rune — Durgeddin’s smith-mark — gleams on the door’s rusted face.

There's also a keyhole....and from somewhere a shaft of sunlight shines directly on said keyhole almost as if beckoning you to stick something in there.

Slate

"That door's keyhole seems to want that key inside it" Slate says plainly.

Iroona blushes for no apparent reason, and then turns to Flint. "Well? Go ahead..."

Whatever is implied here goes over Flint's short little head. he walks forward with the key and goes to insert it in, "Whatever is behind this door, I hope it's a treasure horde! The Nashbae tower could use some repairs." He looks at the key and wonders, then inserts it in and turns it.