Combat against a banshee
I'm not sure if there's a misunderstanding on my part, but I've been skimming through the Barebones Bestiary and I read the following about the Banshee :
" - Incorporeal spirits that linger long after death to haunt the living.
- Unharmed by cold, heat, or the elements. Iron weapon damage is enhanced."
Now, are we talking about iron weapons used against the Banshee? If so, would there be any way to describe/justify how a pretty normal weapon could inflict damage to what is essentially a type of ghost (assuming they've managed to get in hitting range without passing out due to the wailing) ?