Niall's Underwear is a Key Item in Xenoblade Chronicles 2. It is underwear owned by Niall. It can be obtained by Boreas or Mòrag during the quest Hero of the Nopon. There is an optional Field Skill check of the level 3 "Fleet of Foot". If this check is failed, or if the player chose not to have Boreas steal the underwear, then Mòrag will steal the underwear instead.