Before you can participate in the Krokodiloplis Gladiator Arena you will first need to complete the main story quest 'The Crocodile's Jaws Level 28'. Once you have completed the quest you will be able to enter the arena as many times as you like, which can be accessed at Krokodilopolis and call the Gladiator Arena. Unlike the story mission where you had a partner to complete these events, you will be doing these ones alone. There are a total of 8 events split up into two groups to represent two bosses 'The Brothers' and 'The Slaver'.