Experience points (EXP) will be accumulated through the matches. Dragon will level up when they reach the required EXP. The Dragon with higher rarity can accumulate EXP faster.
Each dragon has EXP = 0 as soon as it is spawned from an egg. In order to increase EXP for Dragons, players are required to participate in training skill or participate in battle modes of Game
The higher Dragon's Levels are, the higher the win rates when joining in the training skills or joining in battle modes are. From there, the Dragon will receive more rewards as well as more experience points (EXP)
Levels are decided based on the amount of EXP gained by the Dragon