The Knights Chest is a limited edition Chance Chest going from May 29 - June 2 2014. It gave a x3 chance for Legendary or Epic The new Epic Armor that was introduced along with this chest was Dragonborn Aegis.
1 Chest: 30 Gems
11 Chests: 300 Gems
40 Chests: 0 Gems
11 Chests: 5 Fire Fusion Boosts
40 Chests: 20 Fire Fusion Boosts and Behemoth's Vanguard+