>> Considering your opponent need 30A to get a single demon killer and air gems are much more valuable than blood slaves, perhaps it's not so bad..
30A fetch you TWO demon killers, who are also cloud-trapezing raiders in their own right, who dont really need much equipment to be effective, and are a counter to other raiders.
As for assassins with moonblades against the Shishi... did you try it?
I think this assassin will die in one round.