Summer Solstice
The Solstice Chest is a limited edition chance chest available between June 21st and June 27th. Like all the limited edition chests it costs 30 gems each or 300 for 11 chests.
It is a commemoration of the solstice period/day. It has the highest and most valuable goods (Super Rare Armor and above). It also has the 2 times more of chance of getting a Legendary Armor. It can be opened with 30 gems.