Planescape: Dark Mirrors
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Quartons administer the 16 sectors of the modron realm and oversee the operation of the bureau, sector governors, and army units attached to their regions. Each quarton has a personal staff of those hierarchs assigned to his command, plus 36 pentadrones that act as a guard unit. (These pentadrones can only be told to guard the object resembling the quarton, without ever understanding its role or purpose in their lives.)
Quartons are 12-foot-tall humanoids with four jointed arms and fanlike wings.