SOLVED fantasy trilogy where a man is on a quest to save his sister from his prince but is killed, becomes whoever kills him [s]

[teslyn]

i feel like there might have been a bridge in the title/on the cover of the first book? (view spoiler)[his sister kills him and he becomes his sister (hide spoiler)]
(also whoops how do i move this to Unsolved? And then to solved when/if it gets solved?
edit: kidding, figured it out)

[teslyn]

and (view spoiler)[ there's a side character, a younger boy, who turns into a dragon at the end?? (hide spoiler)]

[teslyn]

it's called Myrren's Gift, book one in the Quickening.

https://www.goodreads.com/book/show/4...