From publisher blurb:
Wrath and Whimsy
Devourer and protector, aid to sorcery and blood crazed belligerent alike, the Horned Queen consumes, infects, and mutates. To some she offers aid and, for others, enlightenment. Can you survive the sights she has to show you?
The Book of Scarlet Abomination is your guide to the cambion princess, Tamarah Pandoramicum and the fell effects she has on those she champions. A full patron write up for the demon, Tamarah Pandoramicum complete with invoke results, taints, spellburn, and unique patron magics.
Also
The Queen’s Doom - A description of her court and the planes it intersects.
Several NPCs detailing those aided and trapped by the Horned Queen.
A bestiary describing that which can be summoned from her Doom
60 pages packed with demonic mayhem