Naa if you want multipule slayer properties you take a different approach than the standard attune the weapon to counter X. Instead of a finely tuned weapon of X slaying you go for maximum overkill. Take my RPG of fly slaying. I dont need to attune it to a specific breed of fly, just point and shoot and the fly is gone.... along with whatever was near it but thats a small price to pay for effiency.
Who is John Galt?