We have some good storyline and theory discussion on this forum, but very little about ISA's origin's. AND she's about to be the main character! Alot of hint's about her background in IBA, mostly that she "relates" to Siris,, So any thoughts on her back story and where it's going ?
First of all, nothign is as it seems in the entire IB storyline. So she's supposedly human and out to get the blade to sell for money. Siris keeps her around and it looks like a possible romantic relationship is brewing.
Soo, the total opposite is probably what is going on..
She's trying to get the blade from the God King in IB1, claiming it's for the $$, but we soon learn that she has more noble reasons for aquiring the blade.
Raidrair watches her through his "video camera" she wears the Helm of a deathless, or one that serves. Raidrair thinks that she may not be deathless OR the ledgers do not have a record of her face (just like Siris)
She tries to kill Siris, TWICE, but he keeps her around, based on a feeling that it is the right thing to do, she later does the same by killing him before Raidrair does, then rebirthing him.
When asked how she knows so much about the deathless, she claims that she once "Stumbled" upon a rebirthing chamber. AND she knows the rebirthing process, as she brings Siris back to life in a Chamber.
Isa explains that A Deathless' child can take their immortality, therefore, it is an unspoken rule to not have children, if they do they kill them. As she is saying this, Siris Dark Thoughts, (Ausar) tell him that ISA knows Too much and she needs to be silenced.
**Siris says " I Lost my entire childhood. I'd like to live a little for myself, Does that make sense?" Isa replies, "More than you can possibly imagine," so there is some unbelievable truth to her past that is tied to Siris. (Maybe she spent her whole childhood training to shoot a crossbow and duel?)
I think that she is a descendant of Ausar's child, he loved the child, but did not trust his Dark Thoughts to kill the child. To avoid killing the child, he began the rebirthing process to erase his memories and save the child and his bloodline. That child and subsequent descendant have been in hiding from other deathless who believe that they could be just as powerful as Ausar and are trying to kill the bloodline. I think ISA is aware of Ausar and who he is. She spent her childhood in hiding and is know attempting to get the Blade so her family can stop running.
I don't think she knows that Siris is Ausar, but Siris and Isa have a deeper connection, hence, she is willing to go into the Vault of Tears to save him, and he was willing to keep her around after she tried to kill him.