After Aleron finished this challenge, he continued to explore the castle and within the next fifteen minutes, he found the remaining two challenge spots and completed them as well, gaining a total of 30 Mystery boxes from three challenges.
Upon completing the third challenge, an exit portal from the ruins appeared along with a notification.
[As you have completed all three challenges, you may have a chance to exit the ruins and head towards further islands for tougher challenges and better riches.]
[You can also choose to trigger the dangerous encounter to obtain the special-tier reward and an additional benefit in this realm.]
'So, I get a special reward and a benefit that's only useful in this realm…' Aleron grinned.
'Let's do it!'
Aleron knew that he was at the bottom of the castle, and he encountered the remaining challenges as he went up.