You can awaken artifact via [Temple Artifact] > [Awaken] in the bottom right side of the screen.
You can acquire various options when upgrading Temple Artifacts. Each Temple Artifact grants extra damage option to a specific class once a requirement is met.
You can acquire a powerful Awaken Skill once you Awaken all 8 Temple Artifacts. The higher the level of awakening of all Temple Artifacts, the higher the level of awakening skill.
Awakening Stone us consumed when awakening a Temple Artifact.