Sacred Shield: each time the target takes damage, they gain a Sacred Shield, absorbing 500 damage and increasing the paladin's chance to critically hit with Flash of Light by 50% for up to 6 seconds. They cannot gain this effect more than once every 6 seconds. Lasts 30 seconds.
As this shield currently functions, when the shield's pitiful 500 damage absorption is used up, both the shield and the crit bonus disappear.
Put bluntly, this is utterly useless. Even the most meager of L80 mobs can deal 200-500 damage in a melee swing, and in an instance or raid setting, this buff barely flashes active before it goes down.
Am I missing something? Is this a bug, or has blizzard once again implemented an ability with no real forethought to long-term usability?