Dragon King (Game Term)
From Talisman Wiki
When a character draws a dragon scale, it is placed on the matching Draconic Lord Card. When the third dragon scale is placed on a Draconic Lord, he is immediately crowned the new Dragon King and the Crown token is placed on his card as a reminder of his status.
In this manner, the Dragon King changes throughout the game and spawns Varthrax, Cadorus, and Grilipus dragon scales on board spaces.