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Rewarded to active players on 20 Oct 2013.

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From Wookieepedia:

A battle droid (also referred to as war droid or killer droid) was any droid designed for combat.

There were numerous types of battle droids. They predated theGalactic Republic by thousands of years, with the earliest known being Rakatan ancient droids and the war-robots used by Xim the Despot.