Revenge of Tim: I know this is late, but if you don't want to use mistletoe, have you considered an alternate Norse-inspired catch? Given what little we know about Ms Gard and her Rune magic from the novels, may I suggest a catch of "weapons bearing a runic counterspell against mystic defence" or alternately "weapons that have been consecrated in honour of Odin (hahaha, I'm getting your boss's approval to stab you) or Loki (hahaha, can your protection withstand my dickery?)"?