A proxy, trained in the Holding, sent into the field to manage other mages and report to the Holding (through the proxy chain) on weather conditions. Reckoners cast in threes but do not form permanent triads.

One who reckons or computes; also, a book of calculations, tables, etc., to assist in reckoning.

an expert at calculation (or at operating calculating machines)

a handbook of tables used to facilitate computation