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One common example of this is necromancy, a divination method that summons the dead for the purpose of communication or making a deal. It’s believed that necromancers possess the ability to revive corpses and order them to do their bidding. They may invoke cursed spirits or demons during a necromantic ritual, thus associating necromancy with black magic.

Psychomancy also includes the communication with deities, angels and saints; a practice that is traditionally associated with oracles, priests and light or white magic. 

Desire

The sacrifice is offered in the hope of, or expectation that, a desired outcome will be granted.

In the case of self-sacrifice, the individual deeply believes that his pain or death will contribute to his desire. To learn more about altruism and self-sacrifice, see the link below.

tealswan.com/self-sacrifice-the-most-self-centered-thing-in-the-world

Sacrifice

The sacrificial ritual is a subjective, symbolic exchange, and no two people perceive or perform it the same. It's important to understand that taking a life is not mandatory for sacred offerings. Human sacrifice is banned across the world, but multiple reports prove that it's an ongoing issue in small and secret communities. 

Warning: the following articles contain authentic reports on human sacrifice in Uganda, including children:

africanlii.org/uganda-prepares-for-new-law-on-human-sacrifice-heres-what-a-case-of-human-sacrifice-looks-like

aa.com.tr/spike-in-human-sacrifice-incidents-worries-authorities-in-uganda

Vulnerability

The human mind is incredibly susceptible; one can convince himself that he's being saved by something or someone. This can be an ideology (religion, virtue, principles) or a person (real or fictional). If the conviction becomes extreme, the person is more likely to resort to violence and even sacrifice other people's lives to protect or reinforce what is sacred to him.

Find out more at:

dictionary.com/sacrifice

Depending on the ritual, other organs would be divined as well. After the ritual, the animal's meat was consumed and the leftovers repurposed. 

The diviner interprets the organ’s color, shape, firmness, texture, anomalies, vessel configuration (typically interpreted as a map) and corpse’s sounds and odors. Traditionally, the diviners looked for signs in:

• the liver (hepatoscopy/ haruspicy), 

• placenta (amniomancy),

• bodily fluids (drymimancy), and 

• blood (hematomancy). 

For more information:

encyclopedia.com/extispicy

The animal's behavior is divined in combination with its surroundings. Its physical appearance and emotional state (like fear, grief, anger, arousal, and peace), paired with the noise it's producing (grunting, puffing, hissing, and screeching), as well as its location, are divined.

The animal can represent any specific energy, person, or event. The diviner attributes the symbolic meaning to the animal and divines the outcome.

A few examples of theriomancy:

One common use of this method is to associate each body part with a symbolically corresponding "energy”, i.e., the feet represent direction in life.

(divination in summary) The practice of discerning the hidden significance of events and foretelling the future. Divination is found in all societies, ancient and modern, though methods vary. In the West, psychics claim innate ability to predict the future, and horoscopes, palm reading, and tarot cards are popular methods of divination. Other methods involve or have involved interpreting dreams, discovering omens in natural events, reading the entrails of animals, casting lots, and consulting oracles. Divination has long been viewed as the province of specially gifted persons, such as prophets, shamans, and magicians.

More on suffixes:

-mancy word-forming element of Greek origin meaning "divination by means of," from Old French -mancie, from Late Latin -mantia, from Greek manteia "oracle, divination," from mantis "one who divines, a seer, prophet; one touched by divine madness," from mainesthai "be inspired," which is related to menos "passion, spirit" (from PIE *mnyo-, suffixed form of root *men-  "to think," with derivatives referring to qualities and states of mind or thought).

-logy word-forming element meaning "a speaking, discourse, treatise, doctrine, theory, science," from Greek -logia (often via French -logie or Medieval Latin -logia), from -log-, combining form of legein "to speak, tell;" thus, "the character or deportment of one who speaks or treats of (a certain subject);" from PIE root *leg-  "to collect, gather," with derivatives meaning "to speak (to 'pick out words')." Often via Medieval Latin -logia, French -logie. In philology "love of learning; love of words or discourse," apology, doxology, analogy, trilogy, etc., Greek logos "word, speech, statement, discourse" is directly concerned.

-scopy word-forming element meaning "viewing, examining, observing," from Modern Latin -scopium, from Greek -skopion, from skopein "to look at, examine" (from PIE root *spek- "to observe").