Returns the tier number for your artifact at the forge.
tier = C_ArtifactUI.GetArtifactTier()
- Number - the completed tier level of your artifact weapon while at the forge on the Vindicaar.
- Returns nil if you are not at the forge or you have no spent tiers.
- If your weapon is rank 70 as an example, your tier will return 2 even though you might have the first relic at rank 3.
- Patch 7.3.0 (2017-08-29): Added.