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"We are ka-tet. We are one from many." Says Roland of Gilead on the day before the Battle of Algul Siento (The Dark Tower VII: The Dark Tower). Ka-tet is the belief that a group of people can be tied together by fate, or ka. (This a concept frequently used by King, even in books that do not use the terms "ka" or "ka-tet"; It, The Stand, and Dreamcatcher are examples; compare with Kurt Vonnegut's Karass) It is said that a group has shared "khef" or the water of life. Sometimes the symbol of water is used literally, as in a ritual Roland and his ka-tet performs the night before the battle of Algul Siento. Roland's ka-tet includes himself, Eddie Dean, Susannah Dean, Oy, and Jake Chambers. This tet was broken after the Battle of Blue Heaven. Donald "Pere" Callahan could possibly be considered ka-tet (or partially ka-tet) at the end of the series. Roland's previous ka-tet included himself, Cuthbert Allgood, Jamie DeCurry, and Alain Johns.