Athar

Athar is basically the "god of the gods". He created the multiverse, humans, the Atharians (also called the Wizards), as well as Death. He is considered immortal and invincible, though dies in both tellings of his history.

History
There are multiple versions of the story of Athar.

One says that after the Atharians grew unhappy, they began fighting, which angered Athar. He hid his anger away in an urn, which soon broke due to how much he had stored inside of it, and created Death. Death killed Athar after killing many of the Atharians, and Death was later subdued by the gods of The Ethereal Plane.

The other telling of this story (considered the "Ruxomar version") goes that Athar was the one who grew bored, and made Death as his brother. Death however grew jealous of being weaker than Athar and used his corrupt magic to turn hordes of hostile mobs onto the realm. Athar fought him but spared his life, but after Death didn't uphold the promise to change for the better, he left for the End and died on the tallest mountain. This version says that there is a prophecy that Athar will return in the form of three gods (presumably Ianite, Dianite, and Mianite, or Botan and his brothers).

Atticus doesn't know how Athar died despite being his respective Historian.

Trivia

 * Athar is the name of the god that the Wizards of Mianite S1 and S2 worship.