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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.

100% Chance To Cast Level 5 Holy Bolt On Striking
+2 To Paladin Skill Levels
+50% Damage to Undead
+100-150 To Life (varies)
15% Slower Stamina Drain
+5% To Maximum Poison Resist
Fire Resist +30%