From the introduction:
Holdfast is a campaign setting for Heroines of the First Age.
It is about a war over the fate of the gods, the domino-line collapse of civilizations, and what bright hope can be found amid the swirling ashes.
Players take the roles of new-made and reincarnated champions thrust into a struggle where every decision seems like the wrong one, fighting to preserve the things that matter most before the flames of conflict consume them.
Play Holdfast if you want to tell stories about a world on the brink of cataclysm and the heroines that can claw it back from the ledge–or send it hurtling over, punching each other all the way down.