Chests have various rewards but they have a certain amount of cooldown. The rewards are divided into reward days or just rewards. The Planet Chests have a 6 hour Cooldown but the Daily Rewards and Group Rewards have a whole day Cooldown! All Chests contain: Element, Coins, Shards, Tokens and Souls. All the rewards (except Tokens and souls) are scaled with your Evolve you have and with Pet Stats. Here's the list of Chests that are in the game:
The Group Rewards is a Chest that actually requires joining the Scriptbloxian Studios Group.
The Daily Rewards is a Chest that has a whole day Cooldown.
The Cybernetic Chest is a Chest that is located on the Planet Zephyr.
Chaos Origins Chest
The Chaos Origins Chest is a Chest that is located on the Planet Inferno.
Rising Eternity Chest
The Rising Eternity Chest is a Chest that is located on the Planet Omega.
Divine Destiny Chest
The Divine Destiny Chest is a Chest that is located on the Planet Elemental.
Dark Nebula Chest
The Dark Nebula chest is a Chest that is located on the Planet Chaos.
The Wren's Chest is a limited time chest, which is located in "Parkour Challenge" on Planet Inferno. The chest will be available until Week 1 ends.