During the ferocious battle with the horde of Raremons and Ex-Tyranomon's attacks, you managed to hold the ship together and chase the Digimon into the open sea, in hope of putting it to justice back on shore.
Its plan was to kill you and ransom your team members to the authorities of File Island, but it clearly was no match for your tremendous power. Still, although defeated, it managed to run away.
After what it felt like tens of hours, you managed to catch up with the fugitive and spot the trail of Raremon exhausted in the sea. But that wasn't all...at the horizon you spot a lump among light mists: the island from your dreams! This is your chance to both catch Ex-Tyranomon and solve the island's mystery.
But when your team flies off in pursuit of the Digimon, you realize that you were too slow after all and it managed to get into the temple atop the island. What happened next was something you never thought of being possible. The island began to quake and move, and it slowly began sprouting limbs and a giant head! It wasn't an island, but a colossal Digimon!
"Who dares to wake my sleep? Nobody is allowed inside my temple, for I guard ancient and dangerous data. You must be punished!"
There was no time to explain that Eldoradimon's sleep was disturbed by an evil Digimon, so you brace yourself for the impeding wave that races towards your ship while your Digimon team races forward!