In episode 16 of The Rising of the Shield Hero (Tate no Yuusha no Nariagari), titled Naofumi and his party face a massive threat that leads to a major world-building revelation. Summary of Episode 16: "Filolial Queen"
The situation changes when they are surrounded by a herd of Filolials and their leader, , appears. Fitoria, an ancient and incredibly powerful Filolial Queen, easily defeats the Tyrant Dragon Rex. Key Revelations and Conflicts: Tate no Yuusha no Nariagari Episode 16
Fitoria expresses deep concern over the heroes' inability to cooperate. She vows that if they cannot work together, she will kill all four heroes so they can be re-summoned as a group that might actually cooperate. In episode 16 of The Rising of the
Fitoria identifies Filo as a potential successor and puts her through a series of tests to see if she is worthy of becoming the next queen. easily defeats the Tyrant Dragon Rex.