This question is from "Across the Ettenmoors" Nightmare scenario, although I'm sure I've met the question before. "Rescue from the Trolls" puts a hero out of play until the side quest is completed.
When the hero comes back into play, what happens to any attachments on the hero card? Similarly, what happens to any tokens (resources and damage)?
Apologies if that has been dealt with before - couldn't find anything on a quick search.