Currently, auto-discover is the way to learn the skill in the game. You can discover skill or has the chance to upgrade the same skill when the character level is upgraded. To distinguish, the undiscovered skill icon is grey while the discovered skill icon is colorful, which means the skill is available to use. Meanwhile, the ways to discover Battle Skill and Basic Skill are also different.
1 random Basic Skill will be automatically discovered as the character level upgrades by 10. The discovered skill will turn colorful automatically. When discovering Battle Skill, the system will choose one from all undiscovered Basic Skills to discover.
1 random battle skill will be automatically discovered with each level up. Once it is discovered, it’ll turn colorful. When discovering Battle Skill, the system will choose one from all undiscovered Battle Skills to discover. When all skills are discovered, there will be no discovery.
Of course, you may be unsatisfied with the discovered skill due to the randomness. If so, you can select “Reset Skill”. Then, the system will randomly discover available Basic and Battle Skills. You can reset skill at will every day.