The carbonite war droid was a battle droid used by the Galactic Empire around the time of the Galactic Civil War. Another variant called the "incinerator war droid" was a droid that had its carbonite projector replaced with a flamethrower.
This humanoid droid stood several meters tall, and was armed with a carbonite projector and a large blast shield. It would use the carbonite projector to immobilize its enemies, as well as freeze objects and spray a cloud of smoke in an area.
In 1 BBY, the Empire created a vast number of war droids with fire and ice attachments. Several of these droids were utilized in Rhador, encasing multiple people in carbonite and then proceeding to wipe out the entire village. These were then used as combat units for the defense on Kamino, Cato Neimoidia, 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.
Starkiller attacks a carbonite war droid.
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.