Although I was planning on giving her a Warcraft-esqued costume; there were so many variations of death knights that I decided to just go with my own design. I pretty much just tweaked her original costume, so there's very much no difference here.
As for the pair of shotel she's wielding; those are one of the few variations of what her twin/double-bladed scythe can shape-shift into. The sclera part of her eyes turning completely jet-black is another thing I tried to pull off; if you look closely, you can just barely identify her pupils from her sclera, in color (that is if the shiny bits don't give that away).
I may have left out her wings; since she's originally a death seraph, but I felt like focusing on her costume more than having to draw more on her back.
Sera "Morte" Azraele © by Yours Truly.