Dirva was a very old female rat and the personal assistant and counselor of the Sable Quean Vilaya. Unlike most vermin counselors, she was friendly and kind to the Quean, almost a mother figure. Vilaya was in turn somewhat kind to her, as well. They both became enemies of the Quean's commander Zwilt the Shade, who mocked her when their Dibbun prisoners escaped.

Soon after they found the tunnel the Dibbuns escaped through, the tunnel was split into two directions. Vilaya and some guards went one way, while Zwilt, Dirva and some guards went the other. Vilaya asked Dirva to spy on Zwilt. When she saw the Shade whispering with a female stoat called Gliv, Dirva went angrily up to the stoat. Though Gliv would not tell her what was going on, Dirva said she would keep an eye on her. That was when Gliv's mate, Lugg, lifted the old rat off of the ground. Gliv put her paws over Dirva's snout and mouth, and suffocated her to death. After Vilaya found Dirva's body, she vowed to kill Zwilt.