Invasion From The Chaos Realm
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Not only was Ruby protecting the island with her magic, but the enormous Fuyu was floating above the skies, channeling her divine powers, and combining them with Charlotte's Unique Skill.
BOOM! BOOM! BOOM! BOOM!
Enormous bombardments of magical and divine energy were released from gigantic cannons surging across Fuyu's body, blasting into pieces dozens of monstrous eldritch creatures that surged from the portals leading to the Chaotic Plane.
The war continued in the skies, as Fuyu protected the island and dealt the most damage, everyone else was resisting the enormous armies of invaders from another dimension.
Nobody could had guessed the Deep One would had possessed the innate ability to open portals to such a place, and he had only not been using it because he required to be first unsealed.
"GRRRRHHHHH…!"