Fighting zombies from a zeppelin in a thunderstorm that challenges archetypal preconceptions of the chthonic by knitting __________

Edit:

Hmm, I think I read "fighting" as an adjective, not a gerund, and missed the "s" on "challenges". I suppose "that" could refer to the undead as well as "who". So I'm changing this to:

Fighting zombies from a zeppelin in a thunderstorm that challenge archetypal preconceptions of the chthonic by knitting __________