Possible reward from Champion of the Dawn★ High-Tier Mission Battlefield with Cait Sith Prime.
The Champion phantom gem (Key Item) is only accessibly after completing the quest Champion of the Dawn. Cait Sith cannot be defeated until it uses Benediction. It will remain at 1% HP until this happens.
Name: ★Champion of the Dawn
Battlefield Entry :Entry KI: Champion phantom gem
Merit Cost: 10
Level Cap: Uncapped
Time Limit: 30 Min
Max People: 6
Home Point: Zulkheim > Selbina (#1)
Enter at Vertical Conflux, (H-7)