There are 5 types of Artifacts that can be equipped: Flower of Life, Plume of Death, Sands of Eon, Goblet of Eonothem, and Circlet of Logos. Only one of each type can be equipped on a character at a time.
All Artifacts have a Main Affix, commonly known as Main Stat, along with up to 4 Minor Affixes, commonly know as Sub Stats or Secondary Stats. These affixes can greatly increase the character's strength in combat. Certain artifact types, such as the Flower of Life and Plume of Death, can only come with a specific main stat, while other types can come with one of many main stats.
How to Obtain
Artifacts can be obtained by exploring Teyvat and finding Investigation Spots and Chests, defeating Elite Enemies and Bosses, claiming rewards from Petrified Trees in Domains of Blessing, and acquiring Chamber Bounties in the Spiral Abyss.
At the highest Domain level, Artifact Domains averages at ~1 5-Star featured artifact and ~1.5 4-Star featured artifacts. Featured artifacts each have 50% to be either of the two types.
A maximum of 1,000 Artifacts can be in a player's Inventory at a time. If the player tries to collect another Artifact, a special notice will appear on-screen.
1-Star to 4-Star Artifacts can be destroyed for Mora. The Artifact must be at Level 0 (+0) with 0 EXP. The Mora received is 420/840/1260/2520 depending on the rarity. 5-Star Artifacts cannot be destroyed.
Artifact Sets are different kinds of artifacts that have different Set Bonuses depending on how many are of that set are equipped on a character. Currently, there are 34 Artifact Sets: