The Nature's Bounty chest was a limited edition Chance Chest going from December 15, 2015, to December 18, 2015. It have a 2x chance for Dragonforged, and a 10x chance for Dragonforged+.
Cost[]
1 Chest: 2 Gems
10 Chests: 20 Gems
50 Chests: 100 Gems
200 Chests: 380 Gems