This item is a reputation reward; you must be Exalted with Shattered Sun Offensive to purchase it from Eldara Dawnrunner at Shattered Sun Staging Area, Isle of Quel'Danas
Patch 2.4.2 (2008-05-13): The triggered effect from this item will no longer break Scattershot or other crowd-controlling affects. The visual on the Scryer version has been updated.
Hotfix (2008-04-10): "Several bugs have been fixed with the Shattered Sun Pendants. Shattered Sun Pendants of Acumen and Might will now be triggered only by spells and abilities which cause damage. Shattered Sun Pendant of Might will no longer break crowd control effects such as Scattershot with its triggered effect. Shattered Sun Pendants of Acumen, Might, and Restoration now all have correct range limits."
Patch 2.4.0 (25-Mar-2008): Added