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Okay, so let's quickly sum things up a bit.
The mermen exist as I thought, they live somewhere in the depths of the sea, as a large tribe of sea people.
The Divine Oasis Spirit is like an Ancient Hero to them?
They apparently aren't born from Yggdrasil, like most races, they came from another world, this world is "Atlantis", where the Oasis Spirit also came from.
There's something, a King of the Depths of sorts, that is a super strong divine beast monster or whatever, and it might have been the original king of the seas.
It was sealed long ago by the Oasis Spirit, but she wasn't strong enough to kill it.
A strange "star" came out of nowhere, fell from the skies, impacted the seal, and shattered it, slowly, it is coming undone.
The King of the Depths has the power to control Sea Monsters, and all the warriors and magicians of the Mermen Tribe are busy defending their home, so they were only able to send these four younglings.
