Ronassic of Sigil is a sage of great renown, a 13th level mage, and a member of the Transcendent Order.
His writings include:
Mind Kampf (a book about Illithids).
Observations [etc.] (a book about beholders).
A Guide to the Ethereal Plane
Sources:
The Illithiad
A Guide to the Ethereal Plane
Die, Vecna, Die! page 131
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