It's some kind of fantasy series that starts on an island archipelago on a tidally-locked planet orbiting a red dwarf star. The sun is always low in the sky, unmoving. Magic is different in their universe, but of course it exists.
A war leaves an agerah orphaned at less than a year old, so off she goes to try to make her way in the world. A human soldier on the opposing side takes her in. He struggles to give her an adequate explanation for why they're still at war when no one wants to be.
Meanwhile the little agerah's older brother comes back from the war and finds out that their parents are dead. He hires a team of human mercenaries to help get revenge for his parents. But before they can put their plan into action, they hear about a plan by the beluli on another island to exterminate everyone on their island and move into the empty space.
The two factions try to make peace and work together to stop their mutual enemy, but they mistrust each other and the beluli take advantage of that to trick them each into thinking the other side has betrayed them. They nearly lose everything.
The little agerah realizes that she's had family on two sides of this war. She's loyal to the side she was born on, that her parents were on. She's loyal to the side her adoptive parent is on. When she brings this up to her brother and the human, they realize that if they were each other's family then they could trust each other. The little agerah's brother uses his mind-editing magic to make himself think that the human is one of his siblings. The human unwards his own mind for the agerah mind mage to do the same to him.
They fight off the invasion and follow the invaders back to their own island. The beluli try to sue for peace. But how can they be trusted not to try to kill everyone again, given the chance? Their world has no command magic. But there is a way if they'll just let the mind mage change them. The only problem is the beluli have no reason to trust that they won't just be slaughtered afterward anyway. So why shouldn't they just destroy the island and kill everyone? Sure, they'll die, but so will everyone else. At least the beluli won't be the only ones to die, that way.
The human who adopted the little agerah asks the mind mage to make him love their enemies. Then he goes to his knees sobbing, begging for peace.
The beluli accept the deal.
Now that both islands are safe from each other, they realize they could unite all the habitable lands on their planet. The entire ring of twilight.
...It's kind of a long series, she might not want to watch all the rest in one sitting.