The colosseum gained popularity in a short time when the Rankers experienced how beneficial it was for their respective Ranking Paths.
After all, it allowed the Rankers to unearth their true potential while fighting with their fears. It made them overcome their fears, making it so that it would not hinder their Ranking Journey anymore.
And by battling with someone else's fears, the Rankers started understanding each other better. Soon, it became a mandatory training module for a lot of Rankers' parties to fight with the fears of their party members, enabling them to gain a new perspective on their teamplay and coordination.
Compared to what Sansara Sage made the Rankers go through in order to gain something from the Life and Death Altar, one could say that the White Raven colosseum offered an easy therapy. It allowed the Rankers to recover from their past trauma. That is if they were able to conquer their fears.
