Their deal is that they're going to destroy the entire world, so they can get back to the world that they came from, and get revenge on the people who stranded them in this world. Furthermore, they show no sympathy to the people of the world they're trying to destroy. In fact, a few them voice outright disgust at the world's inhabitants, and joy in causing them pain. In spite of this, eventually, your characters develop an "honorable opponent" attitude towards them, and on a few occasions, instead of finishing one off, they let him/her go.
Granted, at the points in the story where they let a Veritas go, they either don't know how to kill him/her, or he/she is about to die anyway--but they don't know that he/she is about to die. In fact, one member of your party--Nichol--is filled with a desire to end these Veritas's lives, out of vengeance, but your other party members stop him, because "what good would it do?" Nichol cannot come up with a better answer beyond the fact that he just wants to...
...but I can come up with a better answer than that: They want to fucking destroy the world. They're not going to stop trying to destroy the world. You have no other way of stopping them, that you know of, then outright killing them. So fucking kill them.
The Veritas of Water, the one Nichol particularly wants to kill, apparently cast a spell a long time ago to brainwash herself. She was gentle, and suffered mentally from the damage she did. So she created a ruthless, evil alter ego that would be willing to commit the atrocities she apparently needed to commit. When the player meets her, she is the evil alter ego. Beyond causing mayhem in the town you're currently in, she also kills Nichol's younger brother. After this, she comes out of her hypnosis, and is the gentle, pacifist personality again. Also, she is a distant ancestor to Nichol. The Veritas are 700 years old. Logic follows that, some time after being trapped in this world, she fell out of her hypnosis, became a priestess, helped found the kingdom Nichol is part of--the one she's wreaking havoc on when you meet her--had children... and then put herself back under hypnosis again, for some reason. She offers Nichol penance for her crimes, and once Nichol realizes she is a distant relative, he doesn't want to kill her anymore. Eventually, she and another Veritas help the party against a penultimate boss.
Except the only reason she is alive to do this is because another Veritas convinces the party that she isn't actually evil. Everyone but Nichol takes him for his word. He's still helping the other Veritas in their goal to destroy the world so they can get home, but he's "honorable," and they "don't sense hate in him when they fight him," or something. So they took the word of a genocidal man that a genocidal woman was not actually genocidal, because "actually, he's nice, though."
If the Veritas of Water is so gentle and passive, why did she cast the hypnosis on herself again? Why did she agree to work with the other Veritas? There are other characters who came over with the Veritas, who had the same backstory and powers as the Veritas, but decided not to help them, and outright oppose them. This "kind, gentle pacifist" was not one of those opposed to their plans, however. In fact, she helped them. She must have cast the hypnosis on herself again. It would be beyond a stretch to assume that her evil alter ego helped found the kingdom she helped found, and start a lineage of water priestesses, whose job it was to keep the waters peaceful. So she's gentle and pacifist... but also willing to help the other Sworn Six destroy an entire world, so that they can get back to their own world and get their vengeance on the people there who betrayed them. Once she falls out of her hypnosis again, she has the bad feels for making Nichol so angry, and wants to make it up to him... Apparently it didn't occur to her that she might get bad feels from destroying an entire world. Maybe she thought she wouldn't have to think about it again, once they were in their own world. Who knows.
I've been in the "Second Season" of this game for a few weeks now, I think. The party is now on the Veritas' home planet. Somehow. It's never explained how you got there, without destroying the world from Season One. All of the Veritas--besides the two who had always been on your side--had died by the end of Season One (most likely, though there's a couple you don't see explicitly die). They're now all alive again, on your party's side, and friendly with them. Not even in a begrudging Vegeta or Piccolo kind of way. They're just friends, now, because they were such honorable, worthy opponents, or something. They're also all going by their real names, now, and the plot is doing its best to humanize them. It's working, for the most part.
Now, The Veritas of Water--Folka--and the Veritas of Light--Citra--are fighting over the attentions of Nichol. They both want to be with him. It's somewhat amusing, except for when one considers that Folka is probably a distant relative of Nichol's.
Still, I am reminded that, if I had had it my way, these characters would probably still be dead, and would have died a lot sooner. When the main party spared them, there was no reason to believe that they wouldn't take advantage of that, stab them in the back, and continue with their plans of destroying the world.
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