Evolution (star rank) increases pet main stats. To level up a pet's evolution, you need gold and Pet Soul Stones. The number of Soul Stones required for an upgrade:
- 1st star — 10 Soul Stones;
- 2nd star — 50 Soul Stones;
- 3rd star — 150 Soul Stones;
- 4th star — 500 Soul Stones;
- 5th star — 1,000 Soul Stones;
- 6th star — 2,000 Soul Stones.
You can earn pet Soul Stones by:
- opening Pet Summoning Eggs;
- completing special event tasks;
- buying in a bundle.