From publisher blurb:
A dark star fell from the sky bringing with it the end of all things! The sanctity of the world known as Abaddon was shattered when a global apocalyptic event of a meteor impacting the planet causing a destructive ecological and eldritch change. Now there is no day or night, just never ending Apocalypse. Races of Obsidian Apocalypse: Flesh and Iron adds four new races to the Obsidian Apocalypse campaign setting making the world even more interesting and just as dangerous. Are you willing to take up the fight?
Inside this book you will find you will find over 60 new feats including Animation by Touch, Cannibalism, Drain Life Energy, Holy/Unholy Flames, Lich-Made, Resist Possession, Scab Armor and Unscry; and over 90 new spells including Black Rainbow, Bone Weapon, Burning Brand, Coma, Crucify Foe, Detect Dreams, Examine Coffin, Ice Bolt, Numb Pain, Shrapnel Globe, Soul Burst, Vile Stench and Web Strand.