The First

The First is assumed to be the first being Fate created. (The First's creation pre-dates the creation of Cainin itself.)

The First was the first (and likely only) being Fate created with Free Will, which allows one to turn from Fate's will and follow your own choices. Despite this, Fate assumed the First would still choose to obey It. The First instead defied Fate and has since given--directly or indirectly--other beings free will.

The First is presumed to have either created the human race, or--at the very least--given humans Free Will in the form of souls.

The First brought humans to Cainin, to which neither free will nor humans are native.

After the First help found human civilization on Cainin (and likely founded the city of Aulderston), he left. He has not been seen since, and it is assumed he completely left the world.