Decreases damage taken by 15%, increases armor value from items by 10%, and increases your chance to dodge by 2%.
Sanctuary is a passive paladin ability learned at level 64 for those with the Protection specialization. It decreases damage taken while increasing armor value from items and dodge chance.
Patch changes
Patch 5.0.4 (28 August 2012): Redesigned; changed from Reduces the chance you'll be critically hit by melee attacks by X% and reduces all damage taken by Y%. In addition when you block or dodge a melee attack you gain Z% of maximum mana.; no longer a talent.