Vrumugun, Erisiel

エリシエル=ヴルムグン

For many years, Eris acted as Rezo's assistant, aiding him in his research for a cure to his blindness and in performing miracles. Eventually, she fell in love with him, though it remains unknown whether he reciprocated her feelings. During this period, she assisted Rezo in creating a clone of himself, known as Copy Rezo.
Desperate to heal his eyes, Rezo abandoned Eris to search for the Philosopher's Stone. A few months later, Eris learned that he had been killed by Lina Inverse, Gourry Gabriev, and Zelgadiss Graywords. However, at that time, she was unaware that Rezo contained a sealed fragment of the Ruby Eye Shabranigdu, and that Lina, Gourry, and Zelgadiss had killed him to destroy that piece after his resurrection.
Nevertheless, grieving and angry over Rezo's death, Eris used Copy Rezo to issue a bounty on the trio in the late Red Priest's name. She also hired the bounty hunter Zangulus and created numerous other Copies, including Vrumugun (in the novels, she sent Rahanimu and Dilgear along with Vrumugun). She planned to use the bounty to bring Lina, Gourry, and Zelgadiss to Sairaag, where she could exact revenge on them. However, Copy Rezo betrayed her before she could carry out this plan. Before her death, she realized too late that, no matter how hard she tried, she should have known that Copy Rezo was not the real Rezo. Copy Rezo then blasted her into oblivion, leaving no remains behind.
In the manga, Eris appears only in flashbacks, as the manga depicts Copy Rezo having already killed her before the Slayers even arrived in Sairaag.
Eris' full name is mentioned only in the light novels.