Antrum

an·trum (/ˈantrəm/) noun. a natural chamber or cavity in a bone or other anatomical structure.

Antrum is a city of decadence and corruption, carved out of the hollow bone of some long-dead God. For decades the citizens of Antrum have lived in relative peace, interrupted only occasionally by violence. Smashing some skulls or tossing a vagrant to the spineflowers was required to maintain order. But now the Queen is dead and Antrum is in chaos. The factions of this rotting slum on a ruined planet fight for control. Who will emerge victorious to claim the Calvaria, crown of Antrum? Let’s play to find out.

Antrum is a competitive storytelling and map-drawing game for 3-5 people. Players each represent a faction in a crime-ridden city, vying to seize power. Players take turns adding or revising the maps of Antrum, building the world through play. Factions have access to skills and resources they can use to influence the story in their favor, with the outcome of conflict determined by the throwing of bones (or dice, if that’s all you’ve got). The player who makes the best use of their faction skills and is judged the most creative storyteller by their fellow players will win, but everyone will have fun building the story together.

Includes a random table of 1,008 science fantasy locations and factions.

Game by Sam Walker | Art by Jenn Dickieson

Licensed CC BY-SA 4.0

A web-based version of the rules (good for use with Google Translate) is available here.