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Saoshyant [sou-shyuhnt][needs IPA] is a figure of Zoroastrian eschatology who brings about the final renovation of the world, the Frashokereti. The Avestan language name literally means "one who brings benefit," and is also used as common noun.
In the Gathas, the most sacred hymns of Zoroastrianism are believed to have been composed by Zoroaster himself, the term is used to refer to the prophet's own mission and to his community of followers, who "bring benefit" to humanity. 'Saoshyant' may have been a term originally applied to Zoroaster himself (e.g. Yasna 46.3)
The common noun, which also appears in the Younger Avesta (e.g. Yasna 61.5), is also used as a generic to denote religious leaders and another common noun airyaman "member of community" is an epithet of these saoshyants. In contrast, the standing epithet of the saviour figure(s) is 'astvat-әrәta' "embodying righteousness," which has arta/asha "Truth" as an element of the name. These saviours are those who follow Ahura Mazda's teaching "with acts inspired by asha" (Yasna 48.12).
'Saoshyant' appears as a proper name in the Younger Avesta, explicitly so in Yasht 13.129 where it is used in the singular and where 'Astvat-ereta' is also invoked as an alternate name of 'Saoshyant'. The singular also appears in Yasna 59.1 where Verethragna is said to be Saoshyant's weapon in overcoming resistance. A plural form appears for instance in Yasht 17.1 where Ashi -- the divinity of "recompense" -- is described to give the Saoshyants the power of "making wonderful" (frasho.kereti).
The role of the Saoshyant, or Astvat-ereta, as a future saviour of the world is briefly described in Yasht 19.88-96, where it is stated that he will achieve the frasho.kereti, that he will make the world perfect and immortal, and evil and Druj will disappear. He is identified as the son of Vîspa.taurwairî and it is stated that he will come forth from Lake Kansaoya/Kansava and will carry the same weapon Verethragna that a number of Iranian epic heroes and kings have used in the past against various demonic foes. Haurvatat, Ameretat and other similar entities will be his companions and together, they will vanquish the evil creations of Angra Mainyu.
Already alluded to in scripture (e.g. Yasht 19.88-96, see above), but only properly developed in the 9th-12th century texts of Zoroastrian tradition is the role of the Saoshyant during the final renovation. In these Middle Persian texts, the name is rendered as Sōshans.
Zoroastrian tradition envisions three future saviours, one for the end of each 1,000-year period that comprise the last 3,000 years of the world. All three will be born of maidens, conceived while their mothers bathed in a lake that miraculously preserved the seed of the prophet Zoroaster himself. The first will be named Hushedar, the second Hushedarmah, and the third will be Saoshyant, who will lead humanity in the final battle against falsehood.
The story of the Saoshyant's conception and early life are described in Denkard 7.10.15ff as follows: Thirty years before the decisive final battle, a maiden named Eredat-fedhri ("Victorious Helper") and whose nickname is "Body-maker" will enter a lake (in Yasht 19.92, this is "Lake Kansava"). Sitting in the water, the girl, who has "not associated with men" will receive "victorious knowledge." Her son, when born, will not know nourishment from his mother, his body will be sun-like, and the "royal glory" of Khwarenah will be with him. Then, for the next 57 years he will subsist on only vegetables (17 years), then only water (30 years) and then for the final 10 years only on "spiritual food."
The events of the final renovation are described in the Bundahishn (30.1ff): In the final battle with evil, the yazatas Airyaman and Atar will "melt the metal in the hills and mountains, and it will be upon the earth like a river" (Bundahishn 34.18), but the righteous (ashavan) will not be harmed.
Eventually, Ahura Mazda will triumph, and his agent Saoshyant will resurrect the dead, whose bodies will be restored to eternal perfection, and whose souls will be cleansed and reunited with God. Time will then end, and truth/righteousness (asha) and immortality will thereafter be everlasting.