S2·E25 Desperate Situation: Crisis Upon Lantis

As Umi and Fuu are continuing to fight the invasion of monsters storming the castle they discover the source of the monster's power are the children's fears being taken in like a big black ominous cloud spreading. Worried he hasn't been able to contact Eagle Geo makes the decision to attack, just then Aska shows up, not seeing the Rune Gods around she assumes that they have been defeated and calls out Sang Yung to protect her.