Sons of the Oak is an epic fantasy novel by American writer David Farland, the fifth book in his series The Runelords..

It chronicles the life of the Earth King Gaborn Val Orden's son Fallion as he matures and begins to discover powers even his father didn't have.

When the Earth King, Gaborn val Orden dies, the nations mobilize to destroy his children, fearing they'll usurp power over the kingdoms.

Fallion, his brother, Jaz, and Rhianna, a girl they rescued from monsters called strengi-saats, flee with their mother and the family of Sir Borenson.

Smoker transforms into a fire elemental, destroying the city where the children were being held captive and seriously wounding Shadaoth.