I know the wand is rare, because I've not seen one and I've been looking. Does anyone have any updates as to where it may be looted?

@Smartress, I've not seen much of the Desert Shadow staves for sale or anything. It looks like their damage is slightly less than that of the Set Lightning staves, but I've not seen any Thoth, Isis, Horus, or Osiris varieties at endgame levels yet.