How to use the astrological stone of tower defense elves is the most cost-effective

Activities such as storing astrological stones.

1. Waiting for activities: Game developers will launch preferential activities of astrological stones at a specific time, such as discounts or extra gifts of astrological stones. It will be cost-effective to use astrological stones in these activities.

2. Store the astrological stone: You can choose to store the astrological stone and wait for more hero cards to join the game before using it. This can increase the chances of getting your favorite hero.