Every character has two skills, and each one can be enhanced up to Lv20.
Enhancement has a success rate, so it can fail.
From Lv5 onward, a failed enhancement drops the skill level by 1.
The item used to protect the level can be changed with the swap icon.
Spend Rainbow Crystals or a Skill Protection Stone to protect the level,
and the skill level will not drop even if enhancement fails.
Enhancement can keep running automatically until it reaches the level you set.
It cannot be combined with skill protection.
Tap the number to change the automatic enhancement cap, anywhere from 15 to 20.
※ Automatic skill enhancement is a benefit of the first-time limited pack.
If you run an enhancement with the skill protected, the Rainbow Crystals or
Skill Protection Stone used for protection are spent whether the enhancement
succeeds or fails.