All battle effects in the game that give a temporary boost to one or more targets' Defense rating that lasts until either the battle ends or the effect wears off after a few turns.
“A Guardian Armlet is a Bracelet-class piece of armor found in Golden Sun. It is acquired...Guardian Armlet
“The Captain’s Axe is an Axe-class weapon found in Golden Sun: The Lost Age. It is acquired by...Captain's Axe