Grenn was the first known Log-a-Log of the Guosim, and the only known female leader of the shrew tribe. During Dotti's competition with Bucko Bigbones, she provided useful information and advice and also donated her tribe's last keg of old plum and beetroot wine. She fought against Ungatt Trunn's Blue Hordes along with the rest of her Guosim shrews; Grenn was a great help to Lord Brocktree and his army.