There are several creation myths from the different tribes and peoples across all of Eorzea, however one of the most widely accepted is from Lewphon of Sharlayan, who became noteworthy for compiling information to create a cohesive theory known as the Creation of Eorzea.
While the Twelve are generally assumed to be myths by most scholars in the late Sixth Astral, the Seventh Umbral, and early Seventh Astral eras, four of the Twelve eventually appear before mortals after Hydaelyn's death. These four insist they are not primals, and do not seem to temper those exposed to them.
The Twelve are part of the process of creating your character. In Final Fantasy XIV players can choose from twelve patron deities, each of which represents a moon (or month) of the Eorzean Calendar.
|Halone, the Fury||Ice||Astral||First Astral Moon (January)|
|Menphina, the Lover||Ice||Umbral||First Umbral Moon (February)|
|Thaliak, the Scholar||Water||Astral||Second Astral Moon (March)|
|Nymeia, the Spinner||Water||Umbral||Second Umbral Moon (April)|
|Llymlaen, the Navigator||Wind||Astral||Third Astral Moon (May)|
|Oschon, the Wanderer||Wind||Umbral||Third Umbral Moon (June)|
|Byregot, the Builder||Lightning||Astral||Fourth Astral Moon (July)|
|Rhalgr, the Destroyer||Lightning||Umbral||Fourth Umbral Moon (August)|
|Azeyma, the Warden||Fire||Astral||Fifth Astral Moon (September)|
|Nald'thal, the Traders||Fire||Umbral||Fifth Umbral Moon (October)|
|Nophica, the Matron||Earth||Astral||Sixth Astral Moon (November)|
|Althyk, the Keeper||Earth||Umbral||Sixth Umbral Moon (December)|
The Deity you chose during character creation affected your character's elemental resistances. The total elemental resistance of each deity was 330. There was a 4 point difference between high elemental resistance of 54 and low elemental resistance of 50. These resistances came in the form of fire, ice, wind, earth, lightning, and also water.