The Battle Beasts, manufactured by the Epic Titan, Lord of the Wilderness, for the purpose of waging war, experienced very brief growing periods. Their lives are mainly spent in their energetic prime; they do not age. When their lifespan ends and death arrives, they collapse dead instantly. However, very few Battle Beasts are granted this fate.
Due to the rapid growth of the Battle Beasts, Muria has spent only three years hunting in his father's world with an increasing number of Battle Beasts under his command. He watched as the ten types of Battle Beasts under his command, numbering in the thousands, laid their first batch of eggs. These eggs were naturally collected by Muria.
After Muria received these "rewards", his playing time in his father's world ended. It was time for his father to keep his promise to the Golden Dragon Mother to help him obtain resources, and he had to set out with them.