Droideka

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"Destroyers are quick, pack twin blasters, and come with their own shield generators. Nothing short of a cannon will pierce it, but they do have two weaknesses, and you will need to work together to exploit them. The shields deflect high velocity attacks. What the shields don't stop are slow or stationary objects. They're designed to absorb them so nothing hinders their movement."
"Destroyers are blind from behind. A distraction combined with a rear assault will give you a kill. The trick is to get the right speed on the droid popper."

―Anakin Skywalker and Ahsoka Tano, on how to take out a Droideka^[src]

Droidekas, also known as destroyer droids (destroyers for short),^[1] or as rollies in clone trooper slang,^[11] were a type of droid used by the Trade Federation during the Invasion of Naboo and, later, by the Confederacy of Independent Systems during the Clone Wars. Manufactured by the Colicoids^[1] on Colla IV,^[2] droidekas were dangerous and deadly, designed to exterminate their adversaries with extreme prejudice. They could transform their shape by curling into a ball and moving up to 75 kilometers per hour^[2] across a surface, or stand on three legs and utilize a shield generator while firing at a target. Before the Invasion of Naboo, Obi-Wan Kenobi and Qui-Gon Jinn had to face droidekas on a Droid Control Ship.^[4]

Droidekas came equipped with numerous armaments, both defensive and offensive. In particular, they made use of twin blasters and personal deflector shield generators. A droideka's shields were so strong and powerful that they could easily repel or deflect short-range, high-velocity attacks; rendering sidearms or blasters ineffective. Most hand held weapons did not have enough power to pierce it. Although powerful, they featured several flaws that could be exploited to guarantee a kill; droidekas were blind from behind and their shields were ineffective against slow and stationary objects. Rear assaults, coupled with a distraction and a well thrown Electro Magnetic Pulse grenade, were an extremely effective combination.^[12]

Following the Clone Wars, a droideka known as "The Unwinder," was champion in a gladiatorial arena,^[13] and another droideka was in a scrap pile operated by the Bidvel and Davil, but was activated by, and was able to save, C1-10P from the two. When a B2 super battle droid questioned what they should do now that they were safe, C1-10P suggested forming a group to help other droids, which the droideka presumably joined.^[14] During the Galactic Civil War, the Droideka Oppressor and Droideka Sentinel variants were used by smugglers, and were also used by the Alliance to Restore the Republic and Galactic Empire.^[10] At least one droideka was used as a security droid by Quarantine World III, and chased after Doctor Chelli Lona Aphra when she attempted to steal the Triple-Zero protocol personality matrix.^[9] Aphra later reprogrammed a droideka mark one, Dek-Nil, making him into a probability droid.^[15]