[Event] Promise Gift Box

- Description: A box you received from Elina Leight for making a promise to participate in the Calpheon Ball. Although it's hard to tell what's inside, you'll find out once you keep your promise. - Usage Arrange [Event] Promise Gift Box and [Event] Promise Gift Box Key into the shape of [-] and combine to get Calpheon Ball Gift Box.[Additional in-game details] ※ You can obtain the [Event] Promise Gift Box Key from the Calpheon Ball.