The first person that Yale visited was his grandfather, Graenk.
He had been known as the Battle God previously, but he stopped using that nickname latter because the only one allowed to use it was the first God who obtained the Battle Divinity.
If people of low leveled universes used those names in their ignorance, the rightful owners might not care, but Graenk was already a Great God, so using that nickname would be the same as offending the real Battle God.
The True God that owned the title was quite famous as someone that would start a conflict for any reason, and any person who he discovered that also used the title Battle God ended dying in a battle against him.
Graenk was strong enough to join the Council of Gods, but when Alrein offered it to him far before they learned about the war, Graenk refused because he didn't want to catch any attention.
