Gives your Ice Barrier spell a X% chance to freeze all enemies within 10 yds for 8 sec when it is destroyed.
Shattered Barrier is a Mage talent in the Frost tree that gives a chance of up to 100% that Ice Barrier will trigger a Frost Nova-like freezing effect upon being destroyed by enemy attacks. It requires, obviously, that one take the Ice Barrier talent.
This is one of the Frost tree's iconic PvP talents. Its freezing effect counts towards both Ice Lance's damage bonus and the Shatter crit bonus.
It can be used in combination with Ice Barrier as an additional line of defense against stealthed opponents and general melee or even offensively against any target in 1v1 combat to force a Shatter combo. When trying to do so, use rank 1 of Ice Barrier to have it broken easily by your enemy and trigger the effect quickly. This strategy works well against classes who can't stop their damage reactively such as Affliction Warlocks.
Its freeze is damageless and will not break crowd control such as Polymorph or Sap. This makes it viable for PvE encounters, though not terribly useful.