This look was inspired by the namesake of The Plague Doctor with a little ironic twist; this Plague Doctor doubled as a Grave Robber and rose the dead a la Re-animator style. The Grenth Helm always reminded me a lot of Plague Doctors and so I did my best to make a corresponding outfit for it and what better than to make a necromancer for it.
Sorry, I'm not a story driven person, I just make what inspires me and tell you what I was going for.