Suddenly, in the 1120th century (according to Shawn Bond) and for reasons unknown, Tékumel and its star system (Tékumel's two moons, Gayél and Káshi, its sun, Tuléng, and four other planets, Ülétl, Riruchél, Shíchel, and Zirúna) were cast out of our reality into a "pocket dimension" (known as a "béthorm" in Tsolyáni), in which there were no other star systems. One hypothesis is that this isolation happened through hostile action on the part of an unknown party or group. Another is that the cosmic cataclysm was due to over-use of a faster than light drive which warped the fabric of space. No one knows, but the inhabitants of Tékumel, both human, native, and representatives of the other star-faring races, were now isolated and alone. The novels contain vague clues as to what might have happened.