Multiplayer Ultimate Arena – Two Sides of Divinity and Multiplayer Gleaming Sky’s Contest – Painting of the Celestial Sphere are three-player variants of Arena with different spawns and rewards; they are commonly referred to as 3pa and 3pa2, respectively. Both dungeons have different sets of spawns, bosses, and rewards each, so great care needs to be made when preparing for these challenges!
Multiplayer Update (2020)
Multiplayer dungeons have undergone a renewal; the multiplayer arenas now include more dungeons! See here for the news details.