As a primer to the World of Abaddon and what is in store for the Obsidian Apocalypse campaign setting, there is plenty to gain and get excited about. A world made dead via cataclysm from the skies, undead lords fighting over the scraps, celestials and fiends stranded amongst mortals, and a small living populace which otherwise has no chance at survival in the harsh world. Not only is this a grand entry for PCs looking for some horror, but it's a possible means to "end" and campaign setting, having the party strive for their ends in a world gone to hell. So much potential from this, and it's really just a historical introduction to the world, with plenty more to come. Those who are on the fence about Abaddon and any of the Obsidian Apocalypse products need to give this a read, and it will either sell or kill it for you. More than likely sell it.