My suggestion would be: Mount fang armor recolored in black gray and purplish blue to match the gem on the black cop crown
And make the nuri’s shield in Black, Gray, And the same purplish blue that the black cop crowns gem is also.
If you have the three recolored vanities on I think it should make a set effect like demonic but as black flames, maybe even that purplish blue that the gem is.