Artifacts are only available to unlock in monthly Events and provide various bonuses. They were first introduced in patch v0.99.55. Artifacts are leveled up with Artifact XP, which is also gained from events (granted retroactively to all participants). Artifact XP distribution can be reset once every seven days.
|Image||Name||Effect (Base)||Increase Per Level||Released|
|Frowns Mask||+4% Card Yield||+0.25%|| Halloween Event 2018
25 Blue Candies and level 500
|Santa Globe||+4% Gold Yield||+0.25%||Taking Down Santa Event 2018|
|Gold Dragon||+4% Gold Logs||+0.25%|| New Year Event 2019
Spend 4000 Invest Points
The base upgrade cost is 500. The cost of each level increases by this amount. Every ten levels, ten times the increment is added to the cost and the increment increases by 500. the formula for upgrade cost is 500*level*ceiling(level/10).