Spirit derives from various mythologies.
The snake is associated with the Moon because of its ability to change or renew its skin, which is similar to the Moon's waxing and waning. Both the Moon and the snake are associated with immortality, and the legendary soma drink (which bestows immortality) is brewed from the Moon tree.
The ouroboros (ancient symbol depicting a serpent eating its own tail) is often interpreted as a symbol for eternal cyclic renewal or a cycle of life, death and rebirth.
Fun Fact: there is a real snake that is also known as a moon snake.
Familiars will protect its summoner and attack along with them.
Moon Snake will assist its summoner by help heal.
Summoning ingredients requires: Onyx Circlet