Artifacts are a special magic item that you can earn from Campaigns and level-up to unlock temporary buffs. They also contain lore about the world of Krystara.
You can find information about the current Campaign's Artifact in the Artifact screen of the Campaign.
You can check past Artifacts in your Inventory by selecting your Hero picture in the top left corner of the World Map and going to the bottom of the Inventory screen.
Artifacts can be earned in Campaigns. You will earn the Artifact as soon as the Campaign starts, then for every 100 Stars you earn from the Campaign, the Artifact for the current Campaign will gain 1 level.
For each Artifact level a new chapter of the story will be unlocked and translated from the runic words to your language.
If you don't unlock all the Artifact levels before the Campaign ends, you can still view the full story on the Artifact in your Inventory once the Campaign has ended.
Each level gained on the Artifact also provides temporary skill point bonuses which will last for the duration of the Campaign and be applied in every game mode except when testing your defense team or selecting "fight" on a player's profile.
There is a new Artifact for each Campaign.