A mysterious island was full of giant sand worms, scorpions, and other deadly creatures such as giant toads, venomous giant ants, infectious plants, and so on.
People named this island the Giant Beast Island because everything here was so enormous. The size of the smallest ant was about 40 cm.
"More than one thousand types of creatures live here. The weakest among them are the Spiritual Beasts.
"Beware of your surroundings; your mission here is to battle with those creatures, defeat them as many as possible, and collect the beast cores of those creatures and valuable plants for us. Of course, we will buy those things that we think are worth our spending."
"And if you don't wish to sell them for us, we won't force you."