There are few crossbows in the game that have a AURA-ABLE? graphics component. The
hellfire crossbow,
the storm, etc. Notice the effect. These will definately work correctly, but if the crossbow has ZERO/NONE effect at base, then it typically will have no effect when a Barovian Mist or Sharn aura or store bought aura is applied.
Also, there is a small bug with Arti's at present, where the cosmetic doesn't show sometimes, typically with an empty crossbow hand shown instead.
Just a couple of suggestions, I could be wrong