There are three booster types in the game. Boosters help you upgrade your heroes and their characteristics. You can purchase them in the Guild Championship Shop for 1,500 Global Championship trophies.
Tap the Booster that you want to learn more about.
EXP Booster ▾
EXP Booster maximizes the level of a selected hero to your current team level. The maximum team and hero level is 120.
If the hero's level is higher than one, or you have not maxed out your team level yet, you get back some Global Championship trophies in your Inventory. The lower the hero level or your team level, the more trophies you get back.
Evolution Booster ▾
Evolution Booster increases the evolution level of a selected hero by one star. You cannot raise your evolution level beyond the Absolute Star.
If you have Soul Stones of the chosen hero and the level-up requires less than 300 Soul Stones, you get back some Global Championship trophies in your Inventory. The more Soul Stones you already have, the more trophies you get back.
This Booster does not work for certain heroes. Tap the Booster to view its description and see which heroes are exceptions:
Skill Booster ▾
Skill Booster upgrades the skills of a selected hero to their current level. The maximum level of the first and second skills is 120; the third skill is 100, and the fourth is 80.
If you have already put some points in the skills of the chosen hero, you will get back some Global Championship trophies in your Inventory. The more points you have spent, the more trophies you get back.