It fled to the Prime Material Plane to escape before its enemies could destroy him, and there it fed upon the world of mortals.
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A few decades ago, the wizard Vuren Krabath was fooled into summoning Turaglas, who despite being imprisoned, was able to manifest a portion of itself into the Prime Material Plane.
This book notes that "All known yochlol serve the Queen of Spiders, and appear on the Prime Material Plane only at her command, when summoned by rituals or worship to her."
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They take special delight in escaping the control of those who have summoned them (whom they must serve faithfully for one deed, as decreed by Lolth), and wandering free about the Prime Material Plane.
Prime Minister | Prime Minister of the United Kingdom | Prime Minister of Canada | Prime Minister of Australia | prime minister | Prime Minister of India | Prime Minister of Japan | Prime Minister of Israel | Composite material | Prime Minister of Singapore | Prime Minister of Malaysia | Prime Minister of Pakistan | Prime minister | Deputy Prime Minister | Prime Minister of New Zealand | prime time | Prime Suspect | Prime Minister of Italy | Optimus Prime | Snakes on a Plane | Prime Suspect (UK TV series) | Prime Minister of Spain | Prime Minister's Office | Prime Minister of Sweden | Prime Minister of Northern Ireland | Prime Minister of Russia | Prime Minister of Poland | Prime Minister of Norway | Prime Minister of France | Prime Computer |
They are the building blocks of the multiverse, the elements and energies from which all of the material universe (the Prime Material Plane, or, in the 3rd Edition, simply Material Plane) is made.