These stages can be found with the Evolver and Strengthening stages.
A different stage will be available for each day of the week. Each stage can only be cleared once per day.
Clear the stage to earn a medal for that day of the week. These medals can then be traded in at the exchange for gacha tickets from past events.
Luck bonus will only affect standard drops (book, jump souls, gold etc.) you will not receive additional medals for using a Luck lead.
Stages will rotate out at midnight JST each day.
Make sure to clear them every day so you can earn some free summons!