The Sisters of the Void, also known as the Voidsisters were three sisters who lived on the planet Dathomir during the Galactic Civil War.
Undeads Witches of Dathomir.
Following an outbreak of the blackwing virus on Dathomir, a number of members of the Dathomiri Howling Crag Clan became infected with the disease and in an attempt to contain the outbreak, the Galactic Empire killed most of the clan. However three of the infected witches, Denkra Kymeri, Naija Kymeri and Thestriel Kymeri, survived by using spells to fight off the contagion. They became known as the "Sisters of the Void", assuming the names "Voidsister Warrior", "Voidsister Huntress" and "Voidsister Spellweaver" respectively. Furthermore, the three sisters developed the ability to reanimate the corpses of dead Witches of Dathomir and slaves and control them in battles.
However, the sisters gradually began to lose their battle against the infection, and the Force ghost of their mother, Amaya Kymeri, sent a spacer to kill the trio.