Chapter-7 includes the following three stages.

[7-1 Ephemeral tactical epic]
[7-2 Fill tactical epic]
[7-3 Glacier tactical island](Scheduled to be implemented in 2023/5)
[7-4 (very hard) Aurora tactical palace](Scheduled to be implemented in 2023/6)
(Often delayed in schedule)

It is recommended that you have 400+ Sunstone before purchasing this DLC.