The Circus Maximus is available at Senatus level 85, and functions as a second Arena.
Opens the training menu where you can set the duration and type of training. This will increase the level of you hero which will add levels to the troop and allow him to equip more items.
Circus Maximus functions as a second house, allowing your heroes to gain decreased health from working. Its effectiveness is equal to the house's at that level. A Circus Maximus at the same level as the house doubles the EXP received through training and assisted training.
Opens the adventure menu where you can boost the stats of your hero.