"Our heroes are forced to fight revenant in Ozimal's coliseum."
The Coliseum is the third battle of Act I and the third overall. Like the previous battle, this one has two sources. In this one, you need to guard both lanes with your Defenders.
This battle introduces a new defender class: the Ranger. A new Ranger hero will be available during this battle.
This stage is also the first one where you can choose difficulty levels. From now on, all battles will have 4 difficulties available: Casual, Normal, Advanced and Extreme. Even though defeating them in Casual mode is enough to unlock the next battles, the higher difficulties have better rewards.
After being thrown in the Coliseum arena, Azra meets another prisoner. She asks Azra if that is her first execution, and lets her know that hordes of monsters will be released to kill them. The prisoner introduces herself as Ketta, a nomad huntress.
Ketta says she would better die swinging and prepares herself for the fight. However, when the monsters enter the arena, Azra goes again into the Half-Way bringing Ketta with her, along with Slak.
In the third battle, Azra brings both Slak and Ketta to the Half-Way. Ketta feels weird when going into it, noticing it felt just like when she had the Plague.
This fight is still easy, as the map has a conveniently square-shaped path that is entirely in Ketta's range. Slak should be positioned in a place he can take down both lanes.
The battle introduces a wave of Mad Ghouls, red revenants who can attack adjacent defenders. The wave is not enough to kill Slak, but they could kill your defenders in the next battles if the most fragile defenders are not well positioned.
At the Extreme difficulty, one of the waves is composed of Death Worms, worm-like slow creatures with high HP.
Ozimal gets surprised when the guard says that Azra and her party killed the Revenants, since no one had ever killed them before. Then he decides to throw them in the Prison while he tries to contact a collector, for whom he intends to sell the girl.