Arena.
The Arena was a PVP-only content added about a year ago.
Anyone, regardless of whether they are Gaian or otherworldly, can enter, and fight without any conditions.

It's almost as if someone added it thinking, "I'll use it later, hehe..." and forgot about it, but it's never been mentioned until now.

Surprisingly, the Arena is still quite popular content.

It's not completely risk-free, but at least you can fight with your life guaranteed.
They say you can change the system inside the Arena by touching it.

It makes a legitimate WWE, not UFC, possible.

Since there's also a spectator system, the Arena is always bustling with people fighting and watching.
They say that the most fun thing to do is watch a fight.

"It's a place where only people who do it lightly go, but..."