Players can now experience the brand new Colosseum mode, in which two teams of six players each, must control zones to gain domination of the arena. Players can use units and artillery to take points from the opposing teams, capture their flags and win the battle. Mastering the units, the heroes' many weapon classes and the battlefield is the key to victory in this mode. Although players cannot command cavalry units in the Colosseum, they can fight and recruit gladiators for additional manpower.

Three new unit types can be recruited throughout the season via new unit challenges: The Dimachaeri (3-stars) wield two blades and attack with powerful leaping attacks, the Myrmillones (4-stars) use their swords and shields to repel enemies with ease, and the Retiarii (5-stars) who perform spear attacks and inflict lethal wounds on their opponents, usually resulting in victory.

In the new season campaign, Emperor Hadrianus - a ruler whose power and favor is waning - reintroduces the gladiatorial games to entertain the people of Reginopolis. However, when a mysterious and powerful new faction rises from the shadows to exploit his weakness, a sinister conspiracy is set in motion against him. Weekly challenges during the campaign offer players the opportunity to participate in the gladiatorial games and achieve glory in the Colosseum, while a dark story unfolds.

As players complete the challenges, they can also advance through the ranks of the "Battle Pass" to receive free, high-value rewards, many of which are exclusive to the current season. A new emote and useful consumable items can be unlocked at no additional cost, while the premium Battle Pass includes armor for heroes, units and mounts, and brings the powerful Gladiator Champion armor as a bonus. Heroes who pass the trials of the gladiator games and reach level 100 can dress in centurion armor, based on the elite clothing of military commanders from the Roman Empire.