Artifact Chest

Artifact Chest drops random artifact resources. It is found on Airship:

To open the Artifact Chest, you need Artifact Chest Keys or emeralds. You can get four Keys for free every day:

• by tapping the gift in the hands of Valkyrie,
• for completing the daily quest Begin 1 Expedition,
• for completing the daily quest Begin 4 Expeditions,
• for completing the daily quest Level up any artifact once.

Artifact Chest contains hero artifact fragments, Chaos Cores, and Artifact Coins. Chaos Cores are used together with hero artifacts fragments to increase the artifact's star level. 

When you open the Artifact Chest a specific number of times, you increase its level and get a reward. In addition, all members of your Guild get one Artifact Key. The number of Keys required to level up the Chest increases with each level.

Artifact Chest levels and rewards:

• Level 2 — 1 Artifact Chest Key and 1000 Artifact Coins;
• Level 3 — 1 Artifact Chest Key and 2000 Artifact Coins;
• Level 4 — 1 Artifact Chest Key and 3000 Artifact Coins;
• Level 5 — 1 Artifact Chest Key and 5000 Artifact Coins;
• Level 6 — 1 Artifact Chest Key and 7,500 Artifact Coins;
• Level 7 — 1 Artifact Chest Key and 10,000 Artifact Coins;
• Level 8 — 1 Artifact Chest Key and 10,000 Artifact Coins;
• Level 9 — 1 Artifact Chest Key and 15,000 Artifact Coins;
• Level 10 — 1 Artifact Chest Key and 25,000 Artifact Coins.

Once you open the Artifact Chest ten times, the Open 100 option unlocks: