The Marrden Nagrubs are not of the race of Marro, but so often appear with them on the field of battle that they are always associated with them in the minds of their enemies. Appearing to be some type of deadly massive hound, they are fierce monsters showing even fiercer loyalty to their Marro Hivelord master. Jungle thatches, swampy marshes, and mountain cliff faces seem to be no barrier to a running Marrden Nagrub as it moves swiftly over the most difficult levels of terrain. Ferocious fighting creatures, they show no sign of leaving a battle once the combat begins.