Robetheri was a War Chief of the Nightsisters hailing from the mysterious world of Dathomir. As the Galactic Civil War neared its end, this witch held dominion over the wardens of an Imperial prison, acting as a tyrannical queen.
Originating from Dathomir, Robetheri, a Human female, belonged to a Nightsister coven and was known as a Sister. Her upbringing involved mastering both the arcane arts of Shadow Magic and combat skills. Robetheri's prowess in battle ultimately led to her achieving the esteemed rank of War Chief, solidifying her influential position within her clan.
In the aftermath of the Battle of Endor, Robetheri exercised control over the Imperial prison situated to the north of the Great Canyon. Through manipulation, the witch converted the prison's guards into her loyal followers and established her command center within the former warden's office. She governed with ruthless authority, harboring ambitions of planetary conquest, but her reign was cut short by a coalition of light side Witches who overthrew her.
Like many Force-sensitive witches, Robetheri possessed a range of Force powers, including the ability to Summon Storm, establish Animal Affinity, and achieve Force Flight. As a skilled combatant, Robetheri wielded a Force-imbued quarterstaff, but demonstrated proficiency with blaster pistols as well.