Shattersphere

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Shattersphere is a legendary mace and has great bonuses for a weapon of it's caliber. It provides a great source of knockback and armor crush bonuses.
For 100 http://images1.wikia.nocookie.net/__cb20070321014528/wowwiki/images/1/10/Gold.png it can be upgraded to the more powerful [Breakersphere].
===Source===
This weapon drops from Giants above Level 60, and rarely, demons and dragons above Level 70. It is also a reward from the quest: Known Tools.