Nidhogg one is black and ebil looking, the lore one is also dyeable and mainly black.
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Nidhogg one is black and ebil looking, the lore one is also dyeable and mainly black.
Other than the already suggested Kinna blade/shield, you could try the Horde shield/blade from Nidhogg:
http://i.imgur.com/95N0106.jpg
Or the Zurvanite shield:
http://i.imgur.com/KOJiFy9.jpg
If the weapon matched I think it would be fine. The Ramuh gear carries the red to coordinate with your gear and the purple particle effects carry a somewhat voidsent appearance which, in my opinion, suits the "evil" look.
But as I mentioned before, if you don't like the particle effect, then just use the basic Thunderhead (non-mighty version). You'll still have a little glow, but not the lightning and sparks.
Kinna Shield or bust.
If you don't mind not having particle effects, the Heavy Metal Greatshield is an odd duck. 99% of the shield is black, with gold trim...yet it's the trim that's dyable. XD ...so you can have a nasty looking black shield with red trim.
I like the Alexandrian Metal Buckler dyed Dalamud Red. Fits the whole edgy red / black outfit and looks great with almost any sword.
http://i.imgur.com/uem1y7S.png
There's nothing edgy about the power of holy light no matter how much jet black dye you slather on your armor :P