The Immortals

Esmae and Alysa have never given their birth parents much thought. They've always been normal girls, or rather, normal orphans who've gone through a string of adoptive parents. When they arrive in Brisbane to meet their next new mother, Chloe Green, it isn't long before the three of them embark on a journey that will change them forever.
Merida of Dunbroch is a student of Scathach the Shadow. She's an immortal who's seen her fair share of battles and bloodshed. But 16 years ago, she did something that altered the very future of the world. And now it's come back to haunt her.
The Dark Elders are hunting down the twin girls Merida gave birth to. She may have given them up, but she had her reasons. And one of them was because she cared. But now she has to face the facts; her daughters are in no way normal. They are the humans with the power of a thousand Elders, the most powerful being to ever exist.