Naga

"Finally, she turns her attention to the seas. There, a race of aquatic creatures with tails of serpents is born, created to habit the waters." - Isha creating the naga

Naga
Race of sentient mortal sea creatures. Originally capable of living both in and out of water. Live within the Great Ocean.

First Encounter
"The second speaks to the Folk of the Seas. “Creatures of the Deeps. You have been blessed with knowledge already, and I shall bless you again with the gift of Venom. You shall grow great fangs that shall course with a toxin so potent, that none bearing my gift that shall come after you shall be as feared." -Malsieve speaking with the Naga

Their first gift was that of Venom, given by Malsieve so that they would be feared. It is a potent venom which would prove fatal to any mortal.

Second Encounter
“I am Liria; I am Water and Air, the Medium by which all draw Breath,” Liria announces to the sea people. “You are the Naga, the people who can breathe both water and air. This is a unique and wonderful gift that draws you closer to me than any other living beings. Treasure it always, and never neglect it; do not withdraw just to the water, or just to the air, never visiting the other. Build and do and be great things, but always remember balance. Balance nature, balance yourselves, balance with others.” - Liria speaking with the Naga, her foster children.

The Naga were then given the ambition of balance. To be of both worlds and to encompass Liria's domains of Air and Water.

The Split
After Malsieve cursed the Naga so that they could barely breathe the air, Liria was angered, and attempted to speak to Malsieve so that both her command (balance of water and air) and his wishes could be fulfilled. Malsieve hinted at his future plans, but then ignored Liria's further attempts to speak with him, causing her to take action on her own. Liria gave each Naga the Choice: upon reaching maturity, each Naga could choose whether to give up their venom and be able to breathe the air freely, or to keep their venom and be largely consigned to the ocean. Those who chose to be cleansed of their venom became the Pure Naga, and swore to follow Liria's commands. Those who chose to keep their venom became the Deep Naga.

The War Between the Naga
The Deep Naga, inflamed and led by Agmjir, and aided by the rising of the ocean caused by Liria's tears, attacked the Pure Naga.