The term nagual, also spelled nahual, refers to the guardian spirit of some Mesoamerican Indians. In some areas the nagual is the animal into which certain powerful men can transform themselves to do evil; thus, the word derives from the Nahuatl word nahualli (“disguise”), applied to the animal forms magically assumed by sorcerers.

The person who receives his nagual typically goes to an isolated spot and stays there until he awakens. According to some cultures the nagual becomes associated with a person while he is a child and the first animal to cross over the ashes of the child is his nagual. The belief in nagualism varies from region to region. In some areas it is believed that only the most powerful leaders (usually men) possess naguals. In others, all or most people have personal animal guardian spirits.

Naguals are born with a strong and weak side. The traits of these animals are linked to a person's birth day. For instance, a person born on Dog Day would have both a strong and weak side of a dog. In Mexico, it is believed that a person who receives a nagual must make a pact with the devil in order to be considered as an offering. At night, this animal can transform into a wolf, dog, or a bird.

The nagual is a normal person, usually male, in their physicality while in the human form. They transform into a jaguar according to some records while other say that they start displaying only a few characteristics of the sacred animal.

The word nagual is derived from the word nahualli that translates to "transforming witch." In English, the term is often translated as "shape shifter." In many English writings, it is also spelt nahual.

Naguals are believed to be as powerful as werewolves due to their ability to fight on equal footing. They are also considered to be the creations of the god Tezcatlipoca. Unlike werewolves, a person can easily transform into a nagual at will. However, just like humans, these creatures require special skills and mental strength to overcome their curse. Naguals typically shift when they are threatened, under immense stress, or when they are in the presence of evil although that depends on what sort of person has been cursed into a nagual.

Read about the Nagual at https://mythlok.com/nagual/