Borealis

Borealis is a Legacy Artifact which attacks enemies with a large number of mirror artifacts.
==Obtainment==
Learn the Secret Eastern Codex (Purple Star Sword) manual, and craft it with an Artifact Crafting Skill Level of at least 20 to obtain the Incubation item.
Survive 7 Ascension Tribulations to receive the legacy artifact, which can then be claimed, locking the item to that cultivator. The tribulations can be survived by any character and in any order.
==Uses==
The artifact has a relatively low base damage compared to other artifacts, however it compensates by duplicating itself repeatedly after hitting enemies. 
Every 7 hits from the main artifactXiaWorld.Fight.FabaoBase.OnHitFabaoSpecialAbility, 1 additional sword-sprite is created, which lasts for 7 seconds. It is effectively a less extreme version of Sirius Spike.
==References==