Regarding the origins of the Ethereal Plane, even in the countless books of the Pearl Tower, opinions differed.
Some conjectured that it was the remains of a previous era, but there was nothing to prove such an idea.
And from the rumors spreading from the Astral Sea, the Ethereal Plane was a stand-in world created by Wizard God Lance based on Feinan.
In a most ancient era, the Wizard God successfully created a world called Feinan, but back then, both Lance himself and his fledgeling world were very weak compared to how they would develop in the future.
As a part of a higher Multiverse, this new Universe was definitely tempting to others.
Some unscrupulous beings started invading that world.
And the World Ending Twin Snakes were well-known among them.
The God of Creation, Lance, naturally still had very frightening strength. The absolute control he had over this world made him understand the plane of the World Ending Twin Snakes.