Diablo, Shera, and Rem head out to the plains to test out new magic. While using said Flight Magic, Diablo spots the light of magic energy rising up from deep within the forest, so he makes haste towards its source. However, his spell gives out half way, and he goes plummeting down!

When he lands, he finds the Head Priest, Lumachina under attack from the Paladin, Gewalt.
See, when we summoned a Demon Lord at 
Starfall Tower, his Magic Reflection...
Ähm … Wenn man im Sternschnuppenturm den König
der Dämonen beschwört und die Magie reflektiert wird …
Eh bien, on a invoqué un roi démon
à la tour des météores,
Bom, quando convocamos um Lorde Demônio na
Torre da Chuva Estelar, sua Reflexão Mágica...
Понимаешь, мы попытались
призвать Князя Тьмы на Башне метеоров,