The Shark Chest is a limited edition Chance Chest that was released on September 26th, 2014 and ended on September 30th, 2014. The new Epic released in the chest is the Sharksteel Mantle which is a Mono Water Armor.
1 Chest: 35 Gems
11 Chests: 350 Gems
40 Chests: 1,200 Gems
11 Chests: 5 Water Fusion Boost Armors