Lords of Madness: The Book of Aberrations (2005)

An indepth look at the lore, history, and powers of the most common and best known aberrations of the D&D worlds.

Focus on Aboleths, Beholders, Illithid, Neogi, Grells, and Tsochar.

It includes prestige classes and powers for these monsters, as well as player prestige classes, spells, and items focusing on these monsters.

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From the back of the book...

UNNATURAL CREATURES OF UNSPEAKABLE EVIL

Trembling hands have recorded horrifying stories of encounters with aboleths, beholders, mind flayers, and other aberrations. The victims of these alien creatures are quickly overwhelmed by mind-numbing terror - their only comfort is the hope for a quick death.

This supplement for the D&D game presents a comprehensive look at some of the most bizarre creatures ever to invade the world of fantasy roleplaying. Along with the information about the physiology, psychology, society, and schemes of these strange beings, you’ll find spells, feats, tactics, and tools commonly employed by those who hunt them. Lords of Madness: The Book of Aberrations also provides new rules, prestige classes, monsters, sample encounters, and fully developed NPCs ready to instill fear in any hero.

Expanded by;
The Flow of Fresh Brains