The Elite Battle Droid was a new type of battle droid developed near the end of the Clone Wars. It was meant to replace the B2 Battle Droids as commanders, and be an elite droid for destroying dangerous targets like Jedi. It was based on General Grievous's mechanical body, and standard battle droid parts, and fitted with an improved AI. It could wield four blasters, due to the increased intelligence. Soon after they were developed, the Clone Wars ended and production never began. The prototypes were destroyed by some Jedi who found them in a secret lab on Geonosis.
Personally, I'm not a fan of this MOC. It could be much better, but it is still okay. I really dislike the idea of four arms and I never liked how they were used in the new Grievous, anyway. Despite that, I think I'll still give it 2/5 because its not bad, its simply not in my tastes.