This is a PVP mode where it's 3 knights against one giant knight, or the "boss".
In the lobby: Only 4 players at a time can play in each game. The "boss" knight is randomly picked and labeled as "Boss". The remaining knights are labeled as "attackers". The timer is set at 2 minutes before the game starts.
The arena: a stadium the size of vanaduke's arena; there are seats with knights cheering on each side of the stadium.