Higan: Eruthyll is similar to that of any gacha game on the market as of now, however recently there are reports of a Secret Stage that players may discover by chance which nets you actual SSR characters as rewards.
According to reddit-user u/Unable-Fish645 in his post who has experienced the event, the Secret Stage reveals itself during the completion of a stage and with a text that appears saying, “you are the lucky one.”
Unfortunately, it seems that you may also need to be manually present to activate this stage as it requires an acceptance prompt from the player, as most of the users who have experienced the stage, state that they were manually farming it rather than leaving it on auto.
Not every Secret Stage drops a SSR character however, as some have also shared that they only got 10 x Wish Tickets or a SSR Play Card.
Regardless, due to this revelation we will be looking out for it ourselves and be more present during the end of the stage to hopefully experience this phenomenon and net ourselves some really good freebies.
As of now the official Higan: Eruthyll team has not made any comments regarding the Secret Stage either.
For more on Higan: Eruthyll you may check out our tier list and their official website for more details.