This humanoiddroid stood several meters tall, and was armed with a carbonite-spraying weapon and a large blast shield. It would use the carbonite spray to freeze its enemies, as well freezing objects and spraying a cloud of smoke in an area.
In 2 BBY, The Empire created a vast number of war droids with fire, and ice attachments. These were then used as combat units for defense on Kamino, Cato Nemodia, and in ambushing the Salvation on the Battle near the Itani Nebula. However, none of the Carbonite war droids were used in attacking the said battleship.
A clone of Galen Marek encountered and destroyed several carbonite war droids on Kamino, and in Cato Neimoidia by ripping off their shields with the Force and utilizing their own weapons against them, making them freeze into a statue which could easily be disintegrated by Force push.