If you are using this file from Ziperto, keep the following in mind:
: Another 50-floor challenge that allows you to refight every boss as High Rank, concluding with powerful Elder Dragons.
The 1.3 update adds significant content inspired by the Monster Hunter Stories: Ride On anime series:
: A new 50-floor section within the Tower of Illusions where you can challenge the four "Black Riders" from the anime—Mad, Shadow, Gale, and Lars.