Prior to Patch 2.1, it had the highest 'Life %' bonus in game, up to 35% at level 70. As of 2.1, it triples the duration of Phalanx (with Bowmen and Bodyguard runes only). Moreover, Avatars of the Order summoned through other skills are affected as well.
Stats (Level 50)
“The guardians of the righteous cleave to those whose existence is a virtuous one.” — The Precepts of Akkhan