Mastermind

A Mastermind is a leader of pets. Their primary ability is to summon a small army of one type of pet to do their dirty work. There are generally three pet powers in each power set, each of which summons more powerful pets than the last. These pet powers increase the number of pets that can be summoned as you gain levels. The maximum number of pets is three basic, two advanced, and one ultimate pet.

lvl 1: first pet power
lvl 6: first pet power gets 2nd pet
lvl 12: second pet power
?: first pet power gets 3rd pet
?: second pet power gets 2nd pet
?: third pet power