Myths of the Arena includes:

17 New modular boards, allowing the creation of endless quests.
2 New deadly enemies and their miniatures.
2 New dreadful master enemies and their miniatures.
13 New double-sided modular map tiles.
10 Pitfalls, stone pillars that make the fight more spectacular.
New Items, traps, treasures, events and enemy powers.
A story–driven campaign of 4 Quests across 2 ACTs.
Two Survival Quests.
A brand-new PvP (Player Versus Player) game mode.