From publisher blurb:
Unleash the darkness within with "Diabolical Demons," a supplement that introduces brand new creatures that roam the shadows of the outer planes. Dare to delve into the secrets of the abyss and explore the malevolent realms where chaos reigns and maleficent fiends lurk.
Embark on an enthralling journey through the depths of the abyss, where each page unveils a new horror, a new nightmare, and a new challenge for the brave at heart. From the cunning Clovexen with their goat-like visages to the awe-inspiring Luminoloth that project blinding light, to the water-bound Aqualeth, and the Earthlike Terranoth. Also, meet the Demon Lords Thraexus and Entropy! The this supplement contains a wealth of newly unearthed knowledge about some the most fearsome and enigmatic demons of the Abyss.
Whether you seek inspiration for your darkest campaigns, desire to test your players' mettle with deadly encounters, or simply yearn to satisfy your curiosity about the nefarious denizens of the abyss, "Diabolical Demons" is your gateway to the realms of darkness. The abyss awaits your descent.