Board Thread:False Info and Speculative Discussion/@comment-4815136-20140817115322/@comment-13965604-20140902135710

Ok...*winces* I know I'm going to regret this but...Stiles made something out of nearly nothing once...yes, yes I'm going there again. He had a handful of ash in his hand, was no longer holding the bag, and made one handful of ash leave an inch or more wide line for fifty feet or so. @Stileswolf, yea, no one specifically mentioned that in this thread yet, but it's been mentioned repeatedly before.

The true question is where does one draw the line of whats creature and person with abilities? And that question is highly subjective. I truly believe this show is just going in the premise that 'magic is just science that we don't understand yet'

The simplest answer to the actual op's question is just Banshees, creature or person with abilities, are not affected by mountain ash.