N-K Necrosis II was the Supreme Commander of the Imperial Forces of the Galactic Empire and the later Imperial Remnant during the Galactic Civil War. N-K Necrosis II was a remake of N-K Necrosis, used with parts of the previous droid. His mainframe was similar to Grievous's and his programming was stored in his chest and head. With the Galactic Civil War expanding through the Galaxy, Necrosis spent the next 17 years helping the Empire until his downfall at Bastion, his birthplace.