cRPG is a modification for Mount & Blade II: Bannerlord. It adds persistent multiplayer character stats, hundreds of unique items, an online campaign, clans, duel ladder, a co-op game mode and a few more things.
Here we see two sides in an organized strategus battle purely for the purpose of gaining as much XP as possible. As much and as expensive gear as possible is used to increase the amount of XP gained.
Each side creates a forward spawn near the others lines and kill each other as much as possible.
This particular XP battle was organized by Murdertron and Cikel.