Patch 4.2.0(2011-06-28): Redesigned. This talent is now an activated ability off the global cooldown. It grants 20% increased block amount to a paladin's shield blocks for 10 seconds, with a 30-second cooldown.
Patch 4.0.3a(2010-11-23): No longer increases chance to block. Instead, it increases the amount blocked by an additional 10%, for a total of 40% damage blocked.
Patch 4.0.1(2010-10-12): Redesigned. No longer an active spell, doesn't use charges, doesn't deal any damage upon blocking, and no longer uses spell-ranks. Instead a buff that is gained by using certain other spells. The chance to block is also reduced to 15% down from 30%. Duration is increased to 20 seconds, up from 8.
Patch 3.2.0(2009-08-04): It is no longer possible to have two ranks of this ability active at the same time.