Disgruntled Missive is a book written by a mine guard. It is found next to his corpse in the High Hall Mines.

Trolls! Nobody told us we would be fighting trolls! And there seems to be an endless stream of them pouring out of these stinking caves! So many good men have been taken from us already; Lupus, Garnus, Heftus. Your deaths won't be in vain! Mundus will pay!