From the introduction:
Millenia ago the mind flayers conquered a race of humans and bound them to service, usually employing them as slaves but from time to time selecting particularly choice victims for food. The humans harbored deep resentment for centuries but could not summon up sufficient strength to free themselves from the mind flayer yoke. Gradually, in secret, and with the assistance of Pandemonium, they developed their powers and strength. Now under the leadership of the supreme leader Gith, they are rebelling against their captors in a long and vicious struggle, towards the day they may truly succeed in gaining their autonomy. The race has become known as the Githzerai and they have quickly gained a reputation as powerful psionicists and deadly fighters with an instinct for violence.
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