Nagas are a race of semidivine serpent creatures in Hindu and Buddhist mythology. Female Nagas are called Nagis or Naginis. Usually depicted as human above the waist and snake below the waist, Nagas can also change shape to appear fully human or snake. Nagas and Nagis are known for their strength, supernatural wisdom, and good looks. When Nagis take human form, they can marry mortal men, and some Indian dynasties claim descent from them.
According to legend, Nagas are children of Kadru, the grand daughter of the god Brahma, and her husband, Kasyapa. Nagas lived on earth at first, but their numbers became so great that Brahma sent them to live under the sea. They reside in magnificent jeweled palaces and rule as kings at the bottom of rivers and lakes and in the underground realm called Patala.
Like humans, Nagas show wisdom and concern for others but also cowardice and injustice. Nagas are immortal and potentially dangerous. Some are demons others seem friendly and are worshiped as gods. Nagas also serve as protectors and guardians of treasure both material riches and spiritual wealth. One famous Naga named Muchalinda spreads his cobra hood to shelter the prophet Buddha while he meditates. When the god Vishnu sleeps, he is protected by Shesha, king of the Nagas. Shesha's seven snake heads cover the god. As servants of the god Indra, Nagas over see the distribution of rain. Sometimes they with hold the rain until forced to release it by the eagle god Garuda.

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Informations about Nagas (and my AU)
FantasyJust some general informations about Nagas and my own AU