Regarding the changes for the Monastery of the Two Winds:
I painted Longinus and Pilus as nearly opposite in nature. Longinus was seeking understanding and peace with his upbringing and destruction of his home village. Pilus was obsessed with revenge, plotting not only to take it out on Coaltongue, which he was denied, but also on the world at large for not stopping the wars which helped to form the Ragesian empire and its later invasions of other nations.
Longinus welcomes Tranquility (the Trillith Balance in the written module) in hopes of exploiting her powers to balance out his brother's nature. Pilus was a plotter and planner, seeking the right time to extract revenge on both Ragesia and the rest of the world.
When Tranquility was consumed by exhaustive use of their powers, Pilus grew quickly out of control, using the creations he had started and Caela had finished to plan his final revenge.
Pilus had become a trusted advisor to Ommandamin, helping him to conquer his rivals and subdue uprisings within Ostalin. He groomed Ommandamin to become reliant on his advice to hold power and to set his sights on world conquest. In this way, Pilus was using Ommandamin to extract revenge on the world at large for the devastation of his village and the difficulties he and his brother had gone through.
Pilus helps out the Resistance in the destruction of the Koren Obelisk only because he saw that as a threat to his own plans. I had a blast from the obelisk hit the flying shark, causing it to veer and apparently fall from the sky. In actuality, the flying shark was damaged and Pilus steered it away before it was lost, thus preserving it for later.
During the last module, The Beating of the Aquiline Heart, Pilus returns after the party is successful in removing the ritual in Ragos. He carries the Ostalin army and Ommandamin within the ship, aiming not just for revenge on the Ragesians, but also with the promise to Ommandamin to conquer the world.
A projection of Longinus shows up in the camp of the Resistance outside of Ragos to warn the leaders and the party that his brother is out of control and he no longer had the powers to stop him as he was on his way to destroy both armies so that the armies of Ostalin could conquer the whole known world.
This blended the last two modules and made more sense (at least to me) on what motivated both brothers (peace and resolution versus revenge) in their actions. It also continued the debate of morality within the party over the continued use of souls to power the Torch.