Q. What is Pet?

A.

Pets have the effect of amplifying various abilities of a a character.

There are Possession Effect and Equip Effect, and each pet enhances different stats.

There are grades of pet, Normal, Uncommon, Rare, Heroic, Legendary, Epic, Ancient.

Higher grade pets have more abilities.

It requires Gold and Pet Candy to level up pets.

You can summon pets on [Menu] > [Summon] > [Pet] by using Diamond.

When you summon pets you already own, you acquire pet piece which can be used to upgrade certain pet. 

Universal pet piece can be used to any same grade pet's upgrade.

The upgrade increases the maximum level of pets.