ER arenas – New duel arenas.

It turned out beautifully, and it is definitely worthy of being included in the list of regular battle arenas, not just duel arenas.

Added 47 seconds later
By the way, does this mod also change the sky textures?

No, strictly speaking, the sky textures remain the same, but in the screenshots from the editor, the sky turns out to be divided into squares, so in the preview, I replaced the sky images with similar photographs. If this is bad, I can come up with something else.

Regarding including them in the list of regular arenas, I haven't thought about it yet. I'm currently working on creating new duel characters. But if you want to include these arenas, and generally do anything with them, feel free!)