Alright, so as far as backstory goes Valera is the daughter of a succubus and a sun elf slave who was quickly abandoned by her demonic mother.  After all, no succubus wants to be burdened with offspring so she got the pregnancy over and done with as quickly as possible and then dumped the child on someone else (not sure who so any suggestions are welcome).

Valera grew up and often felt the urges of her demonic mother's blood so it was no shock when she became a domineering and seductive woman of fiendish beauty.  When she became old enough to be considered an adult Valera was touched by the influence of the demon lord Zura after being bitten by a rather stupid vampire.  She gained a vampire's hunger for blood and was given power to mimic those of the abyss itself.

Valera learned to harden her flesh like that of a demons, to punch through the resistance of beings similar to her to her spells, to warp the terrain to be like that of the abyss for a short time, and to make her wings become terrible, dreadful, thins that made her capable of flight.  Over time her hungers grew, her desire for both lust and blood, and led her into the formal employment of enter Blonde's character here.