We literally defeated a fucking Dark Lord aka Sombra, who by far is stronger than all their Unicorn Soldiers combined. We have an army at least twice their numbers, and we are more experienced in large-scale combat.
Let's be fair: we don't know if they have any Sombra/Twilight/Starlight/Starswirl level unicorn battle mage.
Also while Sombra was very strong, he was also an
INCREDIBLY SHITTY tactician. If we fight them, they'll be a lot harder to defeat than Sombra.
The difference now is that we don't have to kill them to the last, and their slaves could possibly be persuaded to help and rebel.
So what should we do with the Ambassador in order to show that we mean business?
I think we should simply let him go. Something like
"You are no longer welcome here. You are no longer my guest, or under my protection. I will not pay for something you have no right on.
Leave and go back to your people, before I do something I might not regret. If you won't give us back our people, we'll get them back another way.
And when that day comes, if even one of them is dead...well, do remember we KNOW exactly who bought them. And we don't forget"
Nothing mysterious, just cost benefit like usual.
Like, I prefer our citizens be alive instead of dead. If we don't buy them they will suffer as slaves and most probably perish. (The talk about the intelligence service carrying out dozens of rescue operations against nobility in a foreign country at the same time is nonsense. No one has ever done anything remotely like that.)
I usually use the following 4 gates for starting wars in quests.
1. We have an objective that we can't get in a less horrific way
2. We are likely to win.
3. We have prepared as well as we possibly can.
4. Things are not getting better, such that we need a dramatic turnaround.
In our case we are 0 for four.
1. We can buy back the existing slaves and work with our allies to stop the piracy.
2. The notion that we can keep fighting immediately after fighting Sombra twice and then all our kingdom's beasts, while our economy rebuilds a nation that is...uh...ambitious I guess. Smacks of 'we'll be welcomed as liberators' to me.
3. There are many more preparations to make (work with abolitionists, make maps, learn about their sorcery...).
4. In a few years our military will be fresher and the Crystal Empire will go from a weight on our neck to a mighty ally.
I understand the appeal of Burden, and I'm not underestimating that particular factor. It will no doubt win, but I believe it is the worse choice for the citizens who were taken, and the worse choice for the future of the region.
[X] Pay Any Cost
Money is replaceable. A person's life is not. Let them count their coins so that, if need be, we will topple their foundations out of sight.
Ok, I'm very sorry I have to be that man but... There MUST be a max value we're willing to put on any individual life. 5000 is more than 3/4 than our yearly income. A few dozen people are not worth that much, sad as it is to say.
If we could be SURE this was a one time thing I might even be inclined to pay, just to avoid the thousands of deaths that come with any war... Except we'd be indirectly acknowledging their right to own our people,and we'd be directly funding their government. Even worse, their WORST nobles!
Think how much they can expand and upgrade their army with that much money, and how many more lives would likely be lost in the coming war.
A few dozen people are not worth that. It's horrible and callous, but it's the truth.
We're the emperor, and we need to think of the long term, big scale consequences of our actions.
It's also an horrible precedent to set.
We've lost THOUSANDS of people in our past wars because we judged the reason we fought for worth the blood price.
To be certain nothing like this ever happens again, to assure the freedom of every citizen of our empire, to keep the faith of our people in us, to maintain our reputations (and yes, reputation IS important) we can't pay.
Hopefully we can weaken them enough with intrigue, maybe even cause a civil war/slave uprising... But we can't coexist with them as they are.
And I'm sure Koryu will agree with me.