2001 · ソースブック（プレイを拡張するルール／オプション）

The Modrons

This supplement explores the ultralawful modrons, geometric creatures native to the Clockwork Nirvana of Mechanus. It presents game statistics alongside background on their history, society, life cycle, and relationships with other planar beings. Most modrons reside in Regulus, maintaining the gears and machinery of their mechanical plane, though they can be encountered throughout the planes. Each follows a specific task, whether repairing Mechanus, serving an unknown cosmic purpose, or pursuing the absolute order that defines their kind.