Xideous is a Shator Gehreleth dwelling in the Gatehouse in Sigil. He is busy researching the truenames of yugoloths in order to complete a revised edition of the Book+of+Keeping. He is being sponsored in this by Zadara, and he has paid for the help of Estavan and Kylie.
Like most shators, he is fond of poetry.
Sources:
Uncaged: Faces of Sigil, pages 114-115
Dragon Magazine #348 - "Core Beliefs - Vecna"
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