Devar-Toi

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Devar-Toi is a minimum-security prison located in Thunderclap, and area of End-World in the Dark Tower series. Several of the events of the novel The Dark Tower occur here. A campus-like complex, Devar-Toi is also known as Algul Siento. The complex housed numerous Breakers, psychics of various types employed by The Crimson King in using their powers to attack and destroy the Beams that tie all of existence together.

Devar-Toi and its operations are shut down permanently by the ka-tet of 19 shortly after the Battle of Calla Bryn Sturgis.