Golden Rule is a 24 page Battletech fiction novella included in the 2019 BattleTech: Beginner Box. Golden Rule is a prequel to the Saga of the Gray Death Legion featuring Durant Carlyle, the father of Grayson Death Carlyle.

One rule to live by... or to die by

It should have been a simple job. Durant Carlyle, Grayson's father, and his fellow Commandos were hired to protect the isolated mining planet of Golandrinas from a local warlord and his own mercenaries. But things are rarely as they seem near the Periphery, and what should have been an easy seek-and-destroy mission turns into something much more dangerous for Durant and his people. And when the true nature of the enemy mercs' mission is revealed, Colby's Commandos will have to learn a new set of rules if they're going to survive...