Whether it was the Purgatory Battlefield or the Nether Battlefield, both were independent planes formed by the collision of the Realms of the Gods every ten thousand years.
Of course, unlike the "Plane Battlefields" directly formed by the collision of the Realms of the Gods—which could be called the playgrounds of the Supreme Powerhouses, where deities from the Realms of the Gods could slaughter and plunder various cultivation resources, and where various fortuitous encounters left behind by Supreme Powerhouses could also be found—the Purgatory Battlefield and the Nether Battlefield enjoyed no such treatment.
Inside the Purgatory Battlefield and the Nether Battlefield, anyone who entered could only slaughter and plunder each other's possessions. There were basically no fortuitous encounters to be found inside, because they were merely accidental "products" of the collisions between the Realms of the Gods.
Chapter 3541