Since generations a temple has been hiding in a massive cliff at surface ocean levels, the temple is known for being half of the structure submerged underwater, giving interaction towards mermaids and those on land; however that age is left behind and forgotten due the rough human nature. Your ancestors gave you the way of entering that place, during your exploration you were visiting a meeting room, where you found a mermaid laying on some rocks, having a distant gaze and she looks sad.