Endeavour / Venture
The Faithful Traitor (Wizard & Dragon Book 2) by Robert Don Hughes
First published 1992 Ballantine.
Seagryn the Powershaper has freed the two-headed dragon, but it was Sheth who made the beast. Now the dragon is scorching the land and devouring its people. And for that, Seagryn is seemingly to blame.
Now a traitor to his former people, Seagryn and his wife are driven from his home as outcasts. Nobody wanted him - nobody but the dragon, Vicia-Heinox.
Seagryn finds himself caught between the people who have disowned him and a malicious - and hungry - two-headed dragon.
Dr. Robert Don Hughes is also the author of The Prophet of Lamath and The Eternity Gene.
https://www.amazon.com/dp/B01DUMYNIE/
https://www.amazon.co.uk/dp/B01DUMYNIE/
https://www.amazon.ca/dp/B01DUMYNIE/