Darth Massac was the Sith Master of Darth Malevola and a rival of Darth Kaos in the years following the Battle of Endor. He led his Sith forces against those of the New Sith Triumvirate from 13 ABY to 16 ABY. He was eventually killed by Kaos on Manaan in 16 ABY. His death brought an end to the war with Kaos.