Accumulates experience as you complete Dungeons, Battle Arena and Bomber Royale matches. When fully charged it produces 1 Empowered Gem Box. This effect can only trigger once a week.
Empowered Gem Box Edition is a Legendary Tome that is obtained by buying it in the Gems tab of the Store for 4000 credits. They produce 1 Empowered Gem Box when they are fully charged. Unlike Common Tomes (that can be used as often as you like without cooldowns), these tomes can only be used once a week, although, they provide more rewards than Common Tomes per individual use.