Devastate Talent

From wow.incgamers.com

Talent: Devastate Talent
Effect: An instant weapon attack that causes 50% of weapon damage plus 15 and additional threat for each application of Sunder Armor on the target. In addition, this attack will renew the duration of the Sunder Armor effect.
Statistics: Rank 2 and above is considered a skill, details of which can be found on the Devastate Skill page.