Power Boosters
From Dragon Mania Legends (DML) Wiki
Power Boosters are the main currency used to power up and activate the powers of Clan Dragons.
The only ways to earn Power Boosters occur in between Clan Events when Trainer's can complete Clan Quests (between 90 and 130 are awarded per quest on typical events, and between 180 and 260 are awarded on double Power Booster events). Power Boosters can also be purchased in exchange for gems at any time during or between Clan Events.