Brother dear—
forgive me my delay in telling you the ending. I needed some time to sort things out. It's been a while now, and I remember it all through a surreal haze, so I hope you won't mind if I'm keeping it short.
There was one more group of guards who interposed themselves on our way to the senate chamber. They were the elite of the Ulfen guard, comprising a werebear and a few human warriors, stoutly loyal to the boy on the throne. One of the humans was evidently a friend of Aridai's, and we tried to convince her of our truth while we fought. Unfortunately, we succeded so only after the fight concluded with all her comrades fallen. Fortunately, she had had the wisdom to surrender when she came within an inch of her own death.
All need for further convincing turned moot when we entered the senate chamber. Carrius was hovering in mid-air, fully in the control of the Legends that made up part of his patchwork soul, circled by clouds of wailing spirits that he weaponized against us. At first, our combined assault left no scratch on Carrius, but still we must have whittled down his wards somehow. At some point, a lucky stroke from Aridai's rapier broke his skin. He looked on his blood in puzzlement — «I... bleed?» — when suddenly we were all whisked away into his mindscape.
A ragdoll lay chained onto a throne in the midst of it all, no doubt representing Carrius' unholy state of being. The chains proved impervious to force. However, six doors led away from this central chamber, each marked with a different color and a design that gave clues to the Legend we would find beyond. One after the other, we opened all six doors and faced the Legends — copies of former emperors of Taldor, as it turned out — in their natural habitat. All of them, at first, were driven to resume active rulership for the glory of Taldor, even if it meant sharing a poor boy's puppeteered body with other souls.
The first one, Gennaris III, faced us on a corpse-strewn battlefield with six animated scimitars aiding him. We had no choice but to slay him with force of arms.
Cyricas made us track him down through the jungles of Sargava, but when we eventually found him, he allowed us to talk him out of his ambition.
We met Beldam I at a gala in his palace, where he demanded that we find the assassins that were going to make an attempt on him. Len found one, but Beldam insisted there was another, which we had missed. As punishment, we were to sip of the poisoned chalice that he had meant for the assassins. Aridai, in a bout of heroism, took the chalice and drank, apparently stomaching the poison without any ill effects. Beldam had just enough time to be impressed before his wife caved in his skull with a bust of himself, as had happened to the real emperor.
Taldaris — an early version of himself — at first proved resistant to reasoning, until I mentioned us meeting his later self, who had long turned away from Taldor such that it may stand on its own feet. This rang true to him, and he stepped down.
Daronlyr XII met us surrounded by hundreds of his famously loyal Ulfen Guards, and challenged us to convince them to change sides. We did our best, but it was not enough to wrest control of them. It did, however, sway enough of them to cause them to break out into infighting, which severed Daronlyr's claim on Carrius. It probably helped that we had an actual, present-day Ulfen Guard with us who had witnessed Carrius' state personally.
The last one, Stavian I, screamed «Sarenite!» as soon as he saw me, and proceeded to visit the wrath of his inquisition on me. He eventually succumbed to the blades of my peers, but not before outright murdering me for my creed. Ow. Luckily, Len had the means to resurrect me, and promptly did so. I would seem I share your gift of being retrievable from death itself, dear brother!
With all six legends defeated, the ragdoll had returned to look like the boy Carrius, and the chains were gone. Unfortunately, his unbolstered soul was too feeble to support life: He was going to die when we left his mindscape. Lady Gael mentioned that, technically, his soul could be healed if someone were to remain here and sacrifice their life for his... but who would do such a thing?
As it turned out, Len would.
At this point, none other than PHARASMA HERSELF appeared in the room and congratulated Len on fulfilling the task she had set for them: To free the soul of Carrius of its unnatural pseudo-life. Len feebly protested that they had acted of their own free will rather than for Pharasma, but when she asked them if they had something to ask of her, Len asked only: «How can I serve you better?» Pharasma then offered to make Len one of her divine servants, either on Golarion or on her side of the Planes, as they preferred. Len chose the latter. That was the last we would ever see of them (much to Gael's chagrin). Both Pharasma and Len vanished, and the rest of us reappeared in the senate chamber.
You know the rest. Eutropia was crowned, and the lot of us were showered with money, status, and favors. Speaking of which: My new townhouse here in Oppara is absolutely glorious; you should absolutely come for a visit as soon as you can. And bring Mum and Dad, too!
Though I have to warn you: The life of a Countess is busier than I expected. I intend to wield my influence at Court to restore Sarenrae to her rightful place in the Taldan pantheon. It's going to take time, but I have a realm-wide reputation, the Queen's ear, and a wealth of resources at hand now, after all. And of course, I mustn't neglect my singing. A student of the Kitharodian is never done with learning.