API C ArtifactUI.GetArtifactTier

Returns the tier number for your artifact at the forge.
 tier = C_ArtifactUI.GetArtifactTier()
==Returns==
:;tier: - the completed tier level of your artifact weapon while at the forge on the Vindicaar.
==Details==
* 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 changes==