Emerald Wars (19/07/15)
From Dragon Mania Legends Wiki
Emerald Wars is an event in which the participating Clans compete with each other over the possession of 5 Emerald Mines. The Clan that holds a higher score at the end of the event is the winner.
Two clans compete to control five Emerald Mines during this event. The ultimate goal is to collect more Emeralds than the rival clan.
The level number on top of each mine shows the maximum Dragon level allowed for the Dragons used to attack it. Mines controlled by the Trainer's Clan are shown with a yellow background, whereas those controlled by the opposing Clan have a red background. Each mine has its own Battle Score counter and it is controlled, at any given time, by the clan with the higher Battle Score. Clan members increase the Battle Score by attacking mines and defeating Trainers from the opposing Clan. Trainers must select the Dragons to take into battle, then choose from three opposing Trainers with different levels of difficulty (as in Arena Battles). If the Trainer is victorious, they will be awarded Battle Points for the mine's Battle Score and a number of Emeralds for the Clan's Score. The points rewarded increase with difficulty and earning of win streaks.
Every player has 6 Energy at maximum and attacking a mine costs 1 Energy. The refill timer of 1 Energy is 60 minutes.The 6 energy can be filled up with 30 gems. If a dragon participates in a battle for controlling an Emerald Mine it needs to rest for a certain amount of time before it can fight again (it can be used outside the event while resting). The resting time can be skipped with Revitalization Tokens earned completing regular clan quests.
Controlled mines produce Emeralds every minute for the controlling clan. The Emeralds earned from this production and Emeralds rewarded from battles is what makes up the Clan's Score. In the end, the Clan with the most Emeralds wins the event and takes home the bigger prize.
Read the full Emerald Wars article for more details.