There was a city called Linnuya, but it was once home to only a few.

Linnuya was a small village by the ocean, the peoples source of income and food was the waters where they caught their fish. But the waters kept getting more and more polluted, and soon the Linnuiyans started to starve.

One girl, by the name of Kuu, found a sick dolphin near the shore. "Why are you so sick?" She asked the dolphin. The dolphin answered "Your home poisons mine, you and I starve together."

Saddened by these words Kuu did her best to clean the ocean, the villagers saw this and joined her. After all their hard work the ocean was clean again and the fish returned.

As Kuu was swimming in the water the dolphin returned. It thanked her for helping it and blessed her village before disappearing for the last time.

The village soon found out what their blessing was. Each villager could breathe under the water and see clear as day under the sea, upon their will their legs could turn into the tail of dolphins and back again.

The Linnuiyans rebuilt their home under the ocean and grew into a city, taking turns being on land and in water.
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Name: Blessing of The Dolphin

Gifter: Unnamed dolphin, referred to as Lumninari

Reason: Cleaning the ocean

Gift: ability to breathe/see underwater and turn into a mermaid

More detail: Sex/being pregnant/child birth can only happen in human form, the children are born in their human form, cannot shapeshift while pregnant but do have the other benefits

Common use: Living underwater, escaping storms