Challenging the Tower of Growth wasn't a prerequisite for something else. It's the reason why Elizabeth and Rumia, as well as their party members that belong to the A-1 class, had postponed accessing the mysterious Tower. Although the two princesses were special and unique, their party members understood that they needed to proceed with what was supposedly done, if not for the System Reboot.
In the colosseum, the princess of Etheria, Elizabeth, was cautiously staring at the man who was standing across from her. This colosseum was mainly used for training purposes by the security personnel or players that were working in this place, one of the most secure prisons in this country.
The expression of the man was of that serene, seemingly accepting the impending death since escaping from such a prison was practically impossible — especially with the presence of the two rulers of their own respective countries.