The Halloween Chest is a limited edition Chance Chest that was released on October 28th, 2014 and ended on November 4, 2014. The new Epic released in the chest is the Ashenfire Robes which is a Fire/Earth. This chest corresponds to the Halloween Boss Collection.
1 Chest: 30 Gems
11 Chests: 300 Gems
40 Chests: 999 Gems
11 Chests: 5 Fire Fusion Boost Armors