I just started reading "La Guilde des ombres" by Anna Triss. Not too sure there is an english traduction ?
"We are all destined for Death's kiss. Only the gods are immortal. »The Guild of Shadows rules the miserable streets of Clepsydra, aka the City of Vices. These elven assassins have been the armed arms of the goddess of Death for five centuries. To accomplish their dark work, they use their sharp blades as well as their supernatural Gifts. On this day, the Shadow Guild welcomes a new recruit into its underground passages. For the first time in the history of Earthflame, a human child is expected to become a Shadow. If she fails to embrace this path, Death will come to claim her dues."