Survive

"Yes." Riya nodded as she started eating. After swallowing the food in her mouth, she said, "The fences are not for sale."

Samuel arched his eyebrows. "Reason?"

"It's an attacking and defending formation," Riya replied. "These two types of formation has always been the most expensive and troublesome."

Food has never been a problem in that world.

Instead, it was the problem of these magic beasts went rampart that made many people's lives difficult. So attacking and defending has always been the most important thing for many magicians, magic warriors, and warriors there.

They would have various methods to grow stronger.

What is it for?

It was naturally to protect themselves. 

Any means that could protect themselves and killed their enemies had always been much more difficult to obtain compared to these lifestyle magic and methods. 

After all, these things were necessary for them to live.