What's the real reason that the Eldest Daughter must cause earthquakes?

Isn't your reason for causing earthquakes mild?

Isn't your reason for causing earthquakes mild?

Today, it's because you didn't eat the lower world's food that you said you wanted to cause earthquakes...

Shut up!

You don't know anything about it...

The earthquakes are necessary!

She doesn't know anything about it ...

I am ... always ...

Heh! That girl is still alone ...