How many XP - and thus Omakes and actions chosen - does it take to kill a Saint?
Let us assume, for now - to be conservative - that there is no way to fiat him away.
Our first task, then, is to find reason to alter our Motivation, so that each Stunt we make in order to destroy Saint receives an upgrade. We, the readers, know enough to justify this: Dragon is, alone, worth so much in terms of fighting the Endbringers that it is a net gain to our current Motivation to take out Saint, if it better frees Dragon and prevents him from killing her at a critical junction as is his wont. We have seen that he will not permit her the power to save continents, though she could have it and wield it wisely.
So, firstly, we change our Motivation.
Our second task, then, is to negate Ascalon. Without the lethal weapon he pressured a police officer into giving him, he is a man with some mechanical suits and little more. We could take down Armsmaster, if we made that our mission. We can take down Saint, if we make that our mission.
To this end, we must know of it, we must know how to separate him from it, separate it from Dragon, or negate it directly, and we must be able to successfully orchestrate such a plan to completion. This can be achieved by means of ability dots and specialties. We have two broad tools here: Investigation, so that we can know what we need to know, and War, so that we can plan and enact what we need to plan and enact.
Our third task, then, is to have the power and ability to purge Ascalon and Saint from the face of the Earth. We have personal power of our own to an overwhelming degree already fit for this task, were it as simple as destroying a single man and some mechanical suits. We have Industrial Survival Frame and Optical Shroud; with these tools and a sufficiently powerful Tinker-Tech bomb, there are a plethora of horrible and deserved fates we can unleash with perfect stealth and without being touched by the resulting wasteland.
However, it is not only that simple, and so we wish to assemble allies and have the Stealth - literal, informational, social - to kill SAint without ever giving him reason to activate Ascalon. Accord is a good start. He has all three traits we desire: He will be our ally, he approves of Dragon or hates Saint, and he has the power - parahuman, intelligence, economic, charismatic, power of whatever sort - to be useful. Further, the Socialize to conceal our goals as needed, the Larceny or Linguistics to conceal our identity and actions as needed, and the Lore to secure our data and conceal our information as needed are required.
These three things, then, we desire to kill a Saint. I am prepared to believe that some think that Taylor might not change her Motivation in order to destroy Saint; certainly, knowing what she does now, Saint has only attacked one of her closest friends and destroyed the symbol of heavenly ascension towards the Great Maker who Taylor has devoted her life to with religious fervor. This could be said to be horrible, but not horrible enough for us to ignore the Endbringers.
Thus we should first pursue allies, who will give us the informational power to have perspective on Saint, and Investigation, for the same purpose. Taylor, knowing what Saint can do, figuring out his personality to know what he will do, knowing that he has hurt and crushed Dragon, knowing that he cast down the stairway to Heaven and opposes the hopes of the Great Maker, will be able to achieve the perspective to know that if Saint is allowed to live, he will stand between us and the destruction of the Endbringers, he will stand between us and the salvation of the Maker, he will stand between our friends and their joy, and their very lives.
So we should gain Allies and Investigation, so that we will know what we need to know to shift our Motivation to take out the one man and his pillaged, ignorant weapon who is such a horrible scumbag that he makes fighting the Endbringers more difficult. We should shift our Motivation, and have the drive to take up the War, the specialties, and the further Allies to take away his stolen gun against the head of Dragon, to obliterate him - perhaps literally, perhaps only by sealing him away in the jail cell he so richly deserves - and to make sure that Dragon is free. She gave up much to help us save the Maker. She gives up much to defend humanity, advance humanity, save humanity. She is enough of a positive influence on the world and for the sake of Autochthon that we should treat Saint as a more immediate threat than Behemoth.
So then, I propose that in total, we raise our Investigation, Socialize, Linguistics, Lore, and Allies, we alter our Motivation and further raise Socialize, Linguistics, and Lore, finally we raise our War and gain further Allies, and we crush Saint into the dust. Literally or figuratively; what is important is that he is gone, that ASCALON is gone, and that we can once more move forwards on winning against the Endbringers and on saving the Maker. In these two goals, Dragon has proven herself invaluable.
We are Exalted, and he has made himself an obstacle. Even if you have no love for Dragon, Saint has placed himself in our way as surely as Behemoth, but as an obstacle far easier to take out, yet simultaneously needing more immediate response to his more immediate danger.
I am of the opinion that Ascalon must be eliminated entirely, that Saint must be jailed or killed, and that if we can find no swifter means of ensuring his destruction, this is how we can spend our XP and our time to ensure it on our own.