Elementals

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Sylph
Sylph (also called sylphid) is a mythological air spirit. The term originates in the 16th-century works of Paracelsus, who describes sylphs as (invisible) beings of the air, his elementals of air.

Since the term sylph itself originates with Paracelsus, there is relatively little pre-Paracelsian legend and mythology that can be confidently associated with it, but a significant number of subsequent literary and occult works have been inspired by the idea. Robert Alfred Vaughan noted that "the wild but poetical fantasies" of Paracelsus had probably exercised a larger influence over his age and the subsequent one than is generally supposed, particularly on the Rosicrucians, but that through the 18th century they had become reduced to "machinery for the playwright" and "opera figurantes with wings of gauze and spangles"

Undine
Undines (or ondines) are a category of elemental beings associated with water, first named in the alchemical writings of Paracelsus. Similar creatures are found in classical literature, particularly Ovid's Metamorphoses. Later writers developed the undine into a water nymph in its own right, and it continues to live in modern literature and art through such adaptations as Hans Christian Andersen's "The Little Mermaid" and the Undineof Friedrich de la Motte Fouqué.

Undines are almost invariably depicted as being female, and are usually found in forest pools and waterfalls. The group contains many species, including nereides, limnads, naiades and mermaids. Although resembling humans in form, they lack a human soul, so to achieve mortality they must acquire one by marrying a human. Such a union is not without risk for the man, because if he is unfaithful, then he is fated to die.