Do note that, as Vladimir Uristovich's skeleton, FallenAngel can't feel pain or be exposed as himself unless in the presence of an object with the opposite signature of the item used to permit the swapping, Anan's soul gem.
From the engravings of Vladimir Uristovich's severely mangled skeleton, dead Duke
Well, that happened. I don't know how Thane woke up as soon as I opened the door to leave her room, but it's impressive. Still, I have access to far more corpses and far more magic. As soon as I find my locus of power, which I hid somewhere as soon as I joined this fortress, I will mentally tame an army of crundles. Crundles are typically seen has harmless, but in large enough numbers and with the element of surprise, anything is possible, especially when the entire military and everyone else will be convinced they're ordinary pets.
Once I do find my locus of power, I'll go from a person of average strength to the dwarf equivalent of a bronze colossus.
Then, I'll talk to my brother. Also, I need to get access to some bronze, some other materials, and a forge. I can make the magic mirror later; those are very simple to make.
Later, at the church
"I remember leaving it right at the site of this church... I think nobody will notice if I lift the tile right here."
FallenAngel IV slowly lifts the hard stone tile on the floor and picks up a glowing grey ring
"There you are. Now, to test my re-acquired strength."
FallenAngel IV walks out of the church, with the ring on his finger
Later, deep beneath the fortress
"Back when I used to wear this all the time, I could mine out an entire quarry with my bare hands. Let's see if I still can do anything like that."
FallenAngel IV shatters a large section of the wall, causing a weak fortress-wide earthquake and filling the tunnel with dust
*cough* "Perfect."
The next day, at the forges
"May I use this forge for a few hours?"
Unspecified metalsmith: "I don't see why not."
"Time to make a copycat of Ob Kat."
Hours pass and FallenAngel IV finishes his creation
"There, a perfect replica of the hammer my brother is contacting the world through. The hardest part is yet to come."
The next day, in Dan's lab
"I hope nobody misses this masterpiece green glass window."
FallenAngel IV takes a handsaw and some resin, cuts wood strips off of a larch log and sticks it to the mirror, then uses the rest of the log as a back to the mirror
"One piece of genetics, taken from the small bit of Thane's blood that got on Vladimir's hand when she crushed it, and..."
FallenAngel IV turns into a mirror-image of Thane
"This is the strangest thing I have ever done and I really really hope this works. I am going to have to drink out an entire barrel or two once I am done."
FallenAngel IV walks out of Dan's lab, wielding a replica of Ob Kat while looking identical to Thane
(OOC: The magic mirror leaves no trace of the original individual unless they want to leave one.)