The dedicated mission on June 6th of the event "Extreme Showdown! God and the Super Warrior" will receive all rewards by strengthening the fragment 24 times.
Soul and Zeny are needed to strengthen
You can enhance the fragment by selecting [Menu] → [Character] → [Enhance Fragment]. Requires souls and zenies for enhancement, and the more rare a fragment is, the more souls and zenies are needed.
Careful selection enhancement compared to the maximum enhancement value
The linked page below has a list of maximum fragment enhancement values and where to obtain them. I want to strengthen the fragment while comparing it with the maximum enhancement value.
One day dedicated mission
This dedicated mission is only for one day, so be sure to clear it by 1:25 on the 15th to receive the reward.