Edgar Rice Burroughs' John Carter of Mars: Prince of Helium Era Supplemental Rulebook provides you with an in depth look at the Prince of Helium era of play for the John Carter of Mars: Adventures on the Dying World of Barsoom roleplaying game.

* Narrator advice on using the themes and tone of the era and the plots of the last eight John Carter novels including The Mastermind of Mars and Skeleton Men of Jupiter.
* New character options for Kaldanes and their Rykors, Morgors, Savators, Masenas and Kangaroo Men, including new pre-made talents, flaws, and expanded accolades and renown spends.
* New narrator characters, those most beloved and despised of the era.
* New strange technology, powers for your players to acquire and mysterious places of the Jeddak of Jeddaks era to explore, all packed with plot seeds to inspire narrators.
* New optional rules for creating exciting inventions that can change the face of your campaigns, and expanded renown rules for characters with exploratory and scientific backgrounds.

This supplement requires the John Carter of Mars: Adventures on the Dying World of Barsoom core rulebook.