Attack On Titan season 4 reveals how the Titans are really made — and it's a much sadder story than you might think. When Attack on Titan begins, the titular monsters are nothing more than flesh-hungry menaces, but as Eren Jaeger and his friends uncover the Titans' secrets, that perspective shifts. The power of the Titans was initially obtained by a slave called Ymir in the distant past. Following Ymir's death, this gift was shared between nine Titan-shifters, who can transform between their regular and Titan forms at will. The mindless creatures plaguing mankind throughout Attack on Titan's early episodes are known as «Pure Titans» — transformed humans who lose their intelligence and cannot change back.
Until now, Attack on Titan has presented its Titan transformations as an ability passed down through Ymir's Eldian bloodline. Only Eldians can become Titans (shifter or otherwise), and the Nine are transferred by eating the current owner. Should a Titan-shifter die without being chewed upon, their power shall be reborn elsewhere in another «Subject of Ymir». By Attack on Titan season 4's second half, these rules are widely known, but when Eren and Zeke Jaeger finally make physical contact in «Two Brothers,» they're transported to the Paths to meet their fabled ancestor, Ymir, in person.
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Face-to-face with the progenitor of all Titans, Eren and Zeke learn the hidden truth behind how Titans are made. Essentially, Ymir constructs them out of sand and «sends» the bodies to wherever in time and space they're required. Despite perishing many centuries prior, Ymir remains the true source of all Titan powers. She now dwells on a spiritual plane known as the Paths,
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