For a long time, there's been speculation as to what exactly Elune is- a Naaru? Something completely unique? But it looks like a seemingly minor detail in the new Artifact trees may have answered that question comepletely.
In some of the in-progress trees, there's bonuses for each of the Pillars of Creation you've collected. And in the Guardian Druid one, it gives the names of all four (that are implemented so far). The first three are all tied to major known Titans- Hammer of Khaz'goroth, for example, but the fourth?
Tears of Elune.
So, now we have Elune tied to one of the four Titanic Pillars of Creation, which in all other cases are named after major Titans themselves. Does this imply that Elune is, in fact, a Titan herself?