First Lord of Kamigawa's nezumi clans.
In Marrow-Gnawer’s home world, Kamigawa, the nezumi are bottom-class citizens, often forced to live in boggy areas outside of towns. Marrow-Gnawer became the ‘first lord’ of the nezumi people when he united three nezumi clans under his rule in a single night.
He has lived in Purgatory for a number of months. He is currently staying at the Imperial Camp.