There are three types of challenge during the Adventure event: Battles, Encounters, and the final Boss Fight which needs to be completed for victory.
Battle: One round clash.
Encounter: Optional shortcuts that allow you to skip certain battles and gain advantages. Encounters are generally harder than Battles.
Boss Fight: The final stage. A re-playable clash where you fight until you win or lose.
Player’s Health: Your health is linked to the Legend you chose. Every time you lose a challenge, you receive Damage. When you run out of Health, you will either be defeated or use the revive option. Upon death, the event ends.
Opponent’s Health: Your opponent’s health is determined by their Legend. In order to be defeated, their HP must be damaged by 100%.