The Closed Arena version is compatible with the vanilla game.
The Atmospheric Arena version requires Glass Domes of Vivec - Atmospheric Arena Add-On.
The Open Arena version requires No-Frills Open Vivec.
Bethesda (original idea of taunting through a dialogue topic with Anhaedra)
Sigourn (for the mod itself)
Qualia (for the suggestion of taking the fight from the Eight Plates to the Arena)
Thanks to Dev Shah for helping me troubleshoot the scripts!
You can do whatever you like with this mod, but please don't take the full credit for it.