The strongest dragon in the age of beasts

The earth dragon god who created the earth, the source world tree that gave birth to life, the thunder storm leopard that shuttles lightning, the puppet cat with ever-changing attributes, the mechanical armor of the pinnacle of technology, and the supreme creation beast.
This is a world with a brilliant beast-monitoring civilization.
How did the young man who traveled to the Blue Star become a stable dragon knight in this glorious world of beast masters.