Empire of Serpents

The end draws near.
United in their efforts to combat King Torian's evil, Gwen and Conal must now come to terms with the fact that the wicked person responsible for the tyranny and suffering, and the one they seek to destroy, is their uncle.
But is being rune-marked with special powers enough to defeat Torian's mages, especially one as powerful as Gimmar the Mage-breaker?
When several kingdoms refuse to join their quest, Gwen and Conal find themselves depending on the one race they know they can trust.
Dragons.