The octuptarra combat tri-droids were advanced combat automata used by the Techno Union and the Confederacy of Independent Systems during the Clone Wars.
About this creation
The stilt-legged spider-like automatons had large balloon-like heads atop their thin stalk bodies, armed with laser turrets. They were named after the eight-eyed, gasbag-headed vine walkers native to Skako.
They were equipped with three laser turrets as standard, one on each side, below each photoreceptor. However, one variant featured four laser turrets. A certain variant was filled with a gaseous virus that would be released upon the droids' destruction, which was highly effective against organic enemy troops. The virus variant were nicknamed "virus droids".
Their rotating multi-jointed assemblies allowed them to change facing almost instantly and they could fire from extended ranges, though they were vulnerable in close-quarters fighting. It was almost impossible to destroy such droids, as all sides conceivably faced the front.
The octuptarra was a smaller cousin of the tri-droid, which was used by the Separatists in campaigns on Mygeeto.
During the Battle of Coruscant, a group of octuptarra tri-droids used their laser beam cannons against Jedi Masters Mace Windu and Yoda. The beams could be maintained, similar to the OG-9 homing spider droid's turret, so the Jedi were able to destroy several tri-droids with one beam by deflecting it with their lightsabers
When the battle was over, the remains of the droids fell into the Coruscant underlevels, where strains of the virus leaked out and caused an unfortunate outbreak of moulting in the city's numerous avian species.
Captain Rex and his trooper attacking the droid in the movie, the clone wars
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Over all the model is good. The three areas that are impressing are; the colour, sand green, cool! The head shape and construction, and the conection of the legs to the body, I can see how you have done this, clever.
Cool creation! However, as raymond said, you've made a mistake: this is a tri-droid, octuptarras are really smaller. With a bigger head and smaller guns, this would be perfect!
PS: the landscape is great too :)