darth plagueis (hego damask) was a male muun dark lord of the sith and master of darth sidious, first referenced in "" by palpatine to anakin skywalker. plagueis later appeared as the protagonist of the non-canonical novel "". he was the master of darth sidious, who claimed that plagueis' abilities in the force grew to such an extent that he could create life by influencing microscopic force-sensitive entities called "midi-chlorians," and even save people from dying. according to the rule of two, plagueis would eventually be killed by sidious in his sleep, who subsequently became the new sith master and would later take on an apprentice of his own. the non-canonical novel reveals that plagueis maintained a public influence as a member of the intergalactic banking clan as hego damask, a benevolent muun, until he was eventually killed in his sleep by sidious. in "", it is revealed that the banking clan was one of the various groups to ally themselves with the separatist alliance.