The Monster Arena is a possible new area by Cowboi and Geistermagier. You can fight any monster you've already encountered, including bosses and even a shadow of yourself. According to Geistermagier, the player would select a monster (possibly multiple monsters) from a drop-down list and then combat would begin with the chosen monster(s). Geistermagier said that the Arena would be "basically for XP".
Not much is known about this map.
Any monster that you have encountered. There also may be a boss in the form of a shadow version of yourself.
- The shadow version of the character may be based off of Dark Samus, a boss in the Metroid series of games, or Dark Link from one of the Legend of Zelda games.