With the good news from the front in Oris comes ...news, possibly also good, from the north.
The magic artifacts captured in Iomedae's assassination are all, to mage-sight, of extraordinary make, many of them made of previously unheard of metals, totally unharmed by multiple direct Final Strikes (any that were in fact not immune to fire were totally gone by the time they got there). It's impossible to tell by initial examination what they do. They're unpowered; they should function continuously, for...their best guess is 'forever'.
They are very, very cautious. They keep everything in the far north, each item distanced as much as is feasible from every other item (that's difficult, as there are dozens of them and they all need to be kept under guard and under good shields, lest Aroden's people attempt to steal them back). The Work Rooms where the testing happens have every kind of shielding known to the Empire. They have teams of people at a different base whose job is just to check the compulsions on, and do deep Thoughtsensing reads of, people at the base engaged in testing. They have long-range Thoughtsensers supervising from behind miles of solid rock, anf unGifted and heavily compulsioned test subjects who seem sincere in their hostility to Aroden and fervent desire not to be possessed by him and die of it, and they have them set up with trap-spells that will kill them if not specifically disabled by the team at the secondary base.
Daily reports are read and approved by people at yet a third site, who have orders to escalate to Altarrin if any signs of Aroden's influence seem to be emerging from anywhere.
The researchers are slow and meticulous and first check whether there are any effects from being in the same room as the items, then from touching them, then from briefly wearing them, then from sustainedly wearing them, then from active efforts to activate the abilities that are plainly latent in some of them.
This still only helps them discern the use of about half of the items. Many of them do different kinds of highly specific shielding. A few of them do highly general shielding that seems inexhaustible; they will block hundreds of attacks, if the attacks are low-powered enough the shield is adequate, and if an attack punches through that doesn't make the shield any weaker for the next one.
The dagger returns to the hand of the person who threw it, as with Fetching.
The helmet gives the wearer Thoughtsensing at a short range and broad-sending Mindspeech at a slightly better range.
The shirt suppresses the effects of old age and makes the bearer physically young and healthy again. (This one was hard to notice, because the test subjects are mostly young; they are indebted to a particular Healer who had a guess about what the magic seemed to be doing.)
The four gemstones that seemed to have been embedded in her rib cage have caused a lot of consternation. Nothing happens when they're picked up, but after they're set back down they persistently orbit the head of the person who picked them up. They can be removed with a force-net. No one is sure how to embed them in a test subject's ribcage like they were in the priestess's and it seems like a high stakes experiment. The tests they've done while the things are orbiting are profoundly inconclusive.
The captured gauntlets have an interior compartment that opens presumably to some secret command or to sufficient days of effort to brute-force it. Inside, there are rings, medallions, pearls, a strand of polished ivory beads. One of the medallions has a powerful latent spell that, when activated, turns it into a wicked eagle's talon that hangs in midair and can support a thousand pounds of weight. This seems irreversible. The talon is still hanging there in midair. Another creates a messenger-construct that looked (except to mage-sight) like an ordinary bird, which flew around until the door was opened and then flew out the door at which point they panicked and destroyed it; they don't know where it would've gone.
The rings do different kinds of shielding, except three that seem to do nothing. They'll keep testing, of course.
Her belt makes the person who wears it tougher, stronger, and faster, very nearly to the limits of human ability; after some careful preliminary testing they got a Healer in to look and the Healer thought it more or less just took an average person and made them into a soldier in peak physical condition. They haven't tested what it does if you're already a soldier in peak physical condition but 'make you a little like the priestess' is the obvious guess.
The boots make the wearer move faster and jump and dodge more easily. They have an activatable ability that takes this from 'startling speed' to 'blindingly superhuman speed' for a short period of time before being exhausted for the day; the activatable ability recharges itself over time, somehow.
The headband makes you smarter. This was hard to notice at first, with the test subjects as heavily compulsioned as they were, but in later rounds of testing it became clear it made you think more clearly, solve puzzles faster, answer questions more rapidly and more persuasively, and in the case of a few test subjects have a nervous breakdown about the compulsions and their general situation. They strongly suspect this one is crucial for Aroden's possession-abilities, somehow; the spell could easily make the mind not just better-functioning but functioning in a way that inclines the wearer towards their god.