Grinak was a rat in Ungatt Trunn's Blue Hordes. He and Rotface were sent by Swinch to get food. On their way back, the two rats (Rotface and Grinak) decided to take a break. While the rats were sitting, they were attacked by Stiffener Medick. Stiffener easily beat the rats. Because of their failure, Grinak and Rotface were killed by Ungatt Trunn.