Principle is the rune word 'RalGulEld' for body armor in Diablo II: Lord of Destruction. Principle is intended for the Paladin class. This rune word may be less difficult to construct than Enigma or Chains of Honor, but a Gul Rune is still quite a rare find. Still, the +2 to Paladin skills and life bonus would come in quite handy for any Paladin who has to get close to his foes.