From publisher blurb:
Come to the Dark Side!
Everyone’s favorite downtrodden anti-heroes and over-the-top villains, tieflings carry within them the touch of the lower planes. Whether it’s a subtle hint of brimstone, glowing red eyes, or full-on red skin and goat hooves, no one expects a tiefling to be a nice guy. Unfortunately, while this can make for a fun character flavorfully, the mechanics of being an untrustworthy tiefling can work against the players of tiefling characters interested in Charisma-heavy classes.
This book aims to give players who want the fact that their character is a tiefling to be more mechanically relevant a way to make that happen, while also providing support for tiefling characters of a variety of classes that don’t typically make much mechanical sense for tieflings. Included are the hell’s troubadour, a bard archetype with a special infernal instrument and the ability to banish souls to hell, the tiefling terror, a bloodrager archetype that unleashes the frightening side of the tiefling’s ancestry, the underworld oracle, an oracle archetype that grants the tiefling a variety of divinatory powers from their connection to the underworld, the blood rebel, a paladin archetype for tieflings who cast aside their heritage, and the abyssal corsair, a swashbuckler archetype for canny and cunning combatants.