don't make the item any more powerful - they are purely cosmetic. They work on Elytra, creating a trail behind each wing, on Swords and Axes, spiraling particles around the victim, on Bows, Crossbows and Tridents, creating a particle trail behind the projectile, and on Pickaxes, creating particles when breaking ores. An item can only have one Artifact enchantment on it at the same time.
Artifact enchantments are colored yellow