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Umma Balsum was a communicatrix who is briefly hired by Derkhan Blueday to communicate with Benjamin Flex during the latter's imprisonment.


Balsum is described as a "plump, hairy woman". As a communicatrix, Balsum was born with the particular thaumaturgic talents, enhanced by years of arduous study, necessary to become a channeler.

She charged two marks per communication attempt, five marks for a connection fee, two stivers minute while psychically-linked to the recipient, plus a noble for communicating with people in restricted areas, such as the Spike.