Boss Challenge (19/07/01)
From Dragon Mania Legends (DML) Wiki
During this Boss Challenge, Trainers can earn a main reward by defeating Boss-like Dragons and smaller rewards (Food, Scrolls, Gold), based on the Level Modifier, by defeating regular Dragons. 1 Gem is given for defeating the first Boss of a lap, 2 Gems for defeating the second, 3 Gems for the third, and 4 Gems for the fourth.
The Elements that can be brought to Boss Battles are restricted, starting with all Elements allowed for the first battles. Defeating a Boss-like Dragon reduces the allowed Elements by taking away 1 random Element, making the restrictions more severe after each Dragon. A maximum of 9 get restricted, leaving the highest 4 Elements as the only exclusions from limitation, being allowed in all battles. The hardest battles allow only 6 Elements: the aforementioned and two other random Elements that change each time a Boss Battle is won. The Elemental restrictions can be refreshed, but there is a waiting period before the next fight can start, and it will only last until the next Boss is defeated. Every battle requires a cooldown period to pass before the next battle can be joined.
When a lap is cleared, a reward is given and the map resets with a new set of battles. Once the 4th lap is completed, the Trainer is rewarded with a Dragon. Any subsequent lap after the fourth one offers a repeatable reward consisting of 10 Dragon Piece Tickets. Boss Challenge laps are usually unlimited with infinite rounds.
Any waiting period can be skipped through the use of Gems. The enemy Dragons are entirely random, thus not all Trainers face the same Dragons. In most cases, the only Dragons encountered by all Trainers, in the same battles, are the main opponents. The levels of all opposing Dragons are in relation to the levels of the Trainer's own Dragons at the moment the Boss Challenge started.