Fever Appeal (フィーバーアピール ; fībā apīru) is a keyword introduced in CB14. Each effect with this keyword can be different, but all of them has either one of the following common parts:
- "by sending Soul Core from this Spirit to the Trash, [additional effects]"
- "you can send Soul Core from this Spirit to the Trash. When you've done so, [additional effects]"
While also "Appeal"-named, Fever Appeal isn't treated as Appeal, meaning any effects that target Appeal don't target Fever Appeal.
In-universe, Fever Appeal is an upgraded version of Appeal, and is often used as a final judgment during competitions. Unlike Constellation Appeal or Star Appeal, Fever Appeal doesn't seem to have a specific theme.