This is the OverCast's PvP Spheres arena, with functioning miniature PvP Spheres built by a variety of different users.
The original large arena was built by Skirvy, and repurposed by redJAZZangel7021 with command blocks.
It was made with the use of creative mode, and took over a month to put together.

The arena is incredibly large, and the idea was for it to seem galactic, with nothing but void beneath the lowest part of the schematic.
The PvP Spheres consists of a main event arena, complete with the arena infrastructure which leads to different combatant rooms and the Spheres themselves.

There are quite a few spheres, all with different themes. Should you want more on your server, they are very easy to make. I can even include a separate submission post for the template for the PvP Spheres. The possibilities for mini-arenas are almost endless!
Our PvP Spheres include the following themed arenas: Nether, End, Ravine, Maze, Beach, Plains, Swamp, Mushroom, Jungle, and Desert.

Many more can be created- hopefully this will spark some ideas on your server. Maybe you could even hold a building contest to let players design a PvP Sphere.

You can even use command blocks to create a sort of PvP "class" system, but as of now, it's a fisticuffs arena. I label this build as 90% complete because of the vast majority of things that could still be done (such as adding new arenas) and because of the command blocks that could be added. Should you choose to use this on your server, you will have to adjust the coordinates on the command blocks accordingly.

Every PvP Sphere and the main arena were custom designed by players on the server. A schematic will be added in the future, but for now, enjoy the OverCast PvP Spheres Arena!

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Additional Notes

Usernames who helped on this project are listed here:
Skirvy
Azurago
redJAZZangel7021
Random0_
cbs192
fireshadow52
TankerGurl
frince101
barrysax2196