You can use the item "Tempering Flame" and Judollars to raise the level of the Torch to enhance your Fighters' stats.
The contents of the enhancement are displayed on the enhancement screen of each Torch.
You can obtain "Tempering Flame" by using "Tempering Spark" in the Item screen. "Tempering Spark" can be obtained from the event exchange screen, etc.
You can use Gems to reset the enhancements by pressing the "Reset" button at the bottom of the training screen.
※50% of the used Judollars and Tempering Flames will be returned.
※All the enhancement details of "Group", "Ability" and "Boost" will be reset.