Open for crafting materials, chaos cores, and rare collectibles. The Featured rare collectibles change weekly.
— Item Tooltip
Chaos Chests is a lootbox that contains many items such as resources and collectibles. These chests can be obtained in lair and dungeon chests uncommonly (although there is code in place so that faster dungeon-rushers will not gain more chests than casual players), and can also be purchased through the Store for 50Credits each (bought either by itself, in a bundle of 11 with a bonus Chest, or in a bundle of 110 with a bonus 10 Chests and a Golden Chaos Chest). Chaos Chests can also be freely obtained through Chaos Factor daily. Players can get 1,500 Chaos Chests by loot collecting the Mega Chaos Chest.
The chests can be opened like any Lootbox, and they grant the player a random item. The in-game description warns that the contents of Chaos Chests can and will change at any time, with no indication of what they contain. Contents range from crafting materials to consumables with a rare chance of various Mounts, Wings, Allies, Boats, and more. Several times these chaos chests will contain rare loot that are only found in certain Chaos Chest Rotations.
Each week the selection of items changes - if you get something one week, you may not get the same thing the next week.
You will not be able to buy Chaos Chests or Golden Chaos Chests in PTS, seeing as this is a form of cheating and could be used to find out the current week's loot and also can be used for immense amounts of Mastery and/or Flux gain.
The following are various contents of Chaos Chests throughout the time it was released: