Droidekas are one of the non-playable characters in LEGO Dimensions 2: The Rise of Enoch, from the Star Wars franchise.
Droidekas were used by the Trade Federation and later the Confederacy of Independent Systems to match their strongest enemies, including Jedi. They were used since the creation of battle droids, but were fewer in number since each had the ability to activate a shield generator and shoot rapid-fire blasts, and as a result were more expensive to manufacture.
In addition to being able to deploy blaster shields and repeater blasters, droidekas were able to roll into spheres to move across the battlefield faster, which was also when droidekas were most vulnerable. Their shield generator could only be penetrated by slow-moving objects, so blaster shots would be deflected back to their attackers.