The Faithful Traitor(1992)
(The second book in the Wizard and Dragon series)
A novel by Robert Don Hughes
In attempting to save his townspeople from the two-headed dragon he had set free, Seagryn temporarily alters the sight of the monster, but the spell does not last long, and Seagryn must feed it before it feeds on him.
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Used availability for Robert Don Hughes's The Faithful Traitor
January 1992 : USA Mass Market Paperback
April 2016 : USA, Australia, Canada, UK Kindle edition