I was thinking the Nàzgul from the hobbit with the mace, cut at the midriff and replace with shredded cloak bits, have the swirling banshees from mortis engine as his attendants, and hover him fairly high over his base.
If I had a million dollars Ide use the Idoneth guy with the huge cape and shred it, give him a huge mace, and have ghosts emerging into and out of said cape... but that mini is like 100 bucks!