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A 466 page “love letter” to Greg Stafford’s World of Glorantha by the lead designers for the 3rd and 4th editions of D&D.


Chaosium this week released 13th Age Glorantha (13G), a mighty new sourcebook for the 13th Age d20-rolling RPG of heroic fantasy, escalating combat, One Unique Things and limb-ripping owlbears. Designed by Rob Heinsoo (D&D 4th Ed) and Jonathan Tweet (D&D 3rd Ed), 13G is set in Glorantha, Greg Stafford’s classic fantasy world of richly imagined cultures, ferocious combat, and colliding mythologies.

13G was designed to entertain longtime fans of Greg Stafford’s world, but is aimed at gamers unfamiliar with Glorantha—one of the most extensively developed and renowned fantasy settings of all time (RuneQuest, HeroQuest, King of Dragon Pass). The 466 page, lavishly illustrated full color book features five new 13th Age classes, five new class variants, two new PC races, a host of new monsters and enemies, and several ready-to-run adventures and heroquests—players can venture into myth to refight the battles of the gods and gain their cosmic powers!

Beginning as a Kickstarter by Rob Heinsoo Games and Moon Design Publications, 13G became a Chaosium release when Moon Design joined the Chaosium ownership and management in mid-2015. 13G backers have now all received their PDF copies, along with the accompanying Glorantha Sourcebook for those who ordered it.

13G has been released as a 466 page PDF, with a full color hardback version coming out in mid 2018. The PDF is currently available from and DriveThruRPG. Purchasers who buy the 13th Age Glorantha PDF from Chaosium receive a coupon for the full price of the PDF back when the hardback book is released.
The newly released Glorantha Sourcebook PDF (GSB) is also available from and DriveThruRPG. The GSB is a systemless sourcebook for Glorantha that can be used to enhance and support any fantasy roleplaying game, including 13th Age Glorantha, RuneQuest, HeroQuest and others. It will also be available in full color hardback later in 2018.

The 13th Age core rules are available from Pelgrane Press.
For more information, interview and review copy requests contact: or

​About Chaosium: Chaosium was founded by visionary game designer Greg Stafford in 1975. For more than forty years, Chaosium has captivated gamers, readers and mythic adventurers worldwide. Its award-winning roleplaying games, boardgames and fiction have been acclaimed as some of the most engaging and innovative of all time. 


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