An Abattoir of Flies (2015)

From publisher blurb:

An Abattoir of Flies is an expansion to the critical-acclaimed Carcass roleplaying game. Abbatoir of Flies provides new roles, campaign rules, new tribes, powers, and a mutltude of advice on how to handle the game. The expansion also expands on the roles, providing insight on how to use them differently, and new world building questions.

The Carcass is a roleplaying story game where players take on the roles of the last members of a dying post-apocalyptic tribe. The tribal leader is dead, the community in tatters, and the future a mystery. What will become of you in this barren wasteland?