Wikipedia - Antiquity
Early necromancy is likely related to shamanism, which calls upon spirits such as the ghosts of ancestors. Classical necromancers addressed the dead in "a mixture of high-pitch squeaking and low droning", comparable to the trance-state mutterings of shamans.[1]
The historian Strabo refers to necromancy as the principal form of divination amongst the people of Persia (Strabo, xvi. 2, 39, νεκρομαντία), and it is believed to also have been widespread amongst the peoples of Chaldea (particularly amongst the Sabians or star-worshipers), Etruria, and Babylonia. The Babylonian necromancers were called Manzazuu or Sha'etemmu, and the spirits they raised were called Etemmu.
Necromancy was widespread in ancient Greece from prehistoric times. In the Odyssey (XI, Nekyia), Odysseus makes a voyage to Hades, the Underworld, and raises the spirits of the dead using spells which he had learnt from Circe (Ruickbie, 2004:24). His intention is to invoke and ask questions of the shade of Tiresias, but he is unable to summon it without the assistance of others.
Although some cultures may have considered the knowledge of the dead to be unlimited, to the ancient Greeks and Romans, there is an indication that individual shades knew only certain things. The apparent value of their counsel may have been a result of things they had known in life, or of knowledge they acquired after death: Ovid writes of a marketplace in the underworld, where the dead could exchange news and gossip (Metamorphoses 4.444; Tristia 4.10.87–8 cool .[1]
There are also many references to necromancers, called "bone-conjurers", in the Bible. The Book of Deuteronomy (XVIII 9–12) explicitly warns the Israelites against the Canaanite practice of divination from the dead. This warning was not always heeded: King Saul has the Witch of Endor invoke the shade of Samuel using a magical amulet, for example. Later Christian writers rejected the idea that humans could bring back the spirits of the dead, and interpreted such shades as disguised demons, thus conflating necromancy with demon-summoning.
Proof for the common knowledge of necromancy and belief in its power is also evident in the New Testament. Others in the court believed Jesus to be Elijah, another deceased prophet. This account is written in Christian Canonical Scriptures, mainly the book of Mark, chapter 6:14-16. “King Herod heard about this, for Jesus' name had become well known. Some were saying, ‘John the Baptist has been raised from the dead, and that is why miraculous powers are at work in him.’ Others said, ‘He is Elijah.’ And still others claimed, ‘He is a prophet, like one of the prophets of long ago.’ But when Herod heard this, he said, ‘John, the man I beheaded, has been raised from the dead!”
Caesarius of Arles (Kors and Peters, 4 cool entreats his audience to put no stock in any demons, or “Gods” other than the one true Christian God, even if the working of spells appears to provide benefit. He states that demons only act with divine permission, and permitted by God to test Christian people. Caesarius does not condemn man here; he only states that the art of necromancy exists, although it is prohibited by the bible.
The historian Strabo refers to necromancy as the principal form of divination amongst the people of Persia (Strabo, xvi. 2, 39, νεκρομαντία), and it is believed to also have been widespread amongst the peoples of Chaldea (particularly amongst the Sabians or star-worshipers), Etruria, and Babylonia. The Babylonian necromancers were called Manzazuu or Sha'etemmu, and the spirits they raised were called Etemmu.
Necromancy was widespread in ancient Greece from prehistoric times. In the Odyssey (XI, Nekyia), Odysseus makes a voyage to Hades, the Underworld, and raises the spirits of the dead using spells which he had learnt from Circe (Ruickbie, 2004:24). His intention is to invoke and ask questions of the shade of Tiresias, but he is unable to summon it without the assistance of others.
Although some cultures may have considered the knowledge of the dead to be unlimited, to the ancient Greeks and Romans, there is an indication that individual shades knew only certain things. The apparent value of their counsel may have been a result of things they had known in life, or of knowledge they acquired after death: Ovid writes of a marketplace in the underworld, where the dead could exchange news and gossip (Metamorphoses 4.444; Tristia 4.10.87–8 cool .[1]
There are also many references to necromancers, called "bone-conjurers", in the Bible. The Book of Deuteronomy (XVIII 9–12) explicitly warns the Israelites against the Canaanite practice of divination from the dead. This warning was not always heeded: King Saul has the Witch of Endor invoke the shade of Samuel using a magical amulet, for example. Later Christian writers rejected the idea that humans could bring back the spirits of the dead, and interpreted such shades as disguised demons, thus conflating necromancy with demon-summoning.
Proof for the common knowledge of necromancy and belief in its power is also evident in the New Testament. Others in the court believed Jesus to be Elijah, another deceased prophet. This account is written in Christian Canonical Scriptures, mainly the book of Mark, chapter 6:14-16. “King Herod heard about this, for Jesus' name had become well known. Some were saying, ‘John the Baptist has been raised from the dead, and that is why miraculous powers are at work in him.’ Others said, ‘He is Elijah.’ And still others claimed, ‘He is a prophet, like one of the prophets of long ago.’ But when Herod heard this, he said, ‘John, the man I beheaded, has been raised from the dead!”
Caesarius of Arles (Kors and Peters, 4 cool entreats his audience to put no stock in any demons, or “Gods” other than the one true Christian God, even if the working of spells appears to provide benefit. He states that demons only act with divine permission, and permitted by God to test Christian people. Caesarius does not condemn man here; he only states that the art of necromancy exists, although it is prohibited by the bible.
Wikipedia - Lich
The lich developed from monsters found in earlier classic sword and sorcery fiction, which is filled with powerful sorcerers who use their magic to triumph over death. Many of Clark Ashton Smith's short stories feature powerful wizards whose magic enables them to return from the dead. Several stories by Robert E. Howard (such as the Skull-Face novelette and the short story Scarlet Tears) feature undying sorcerers who retain a semblance of life through mystical means, their bodies reduced to shriveled husks which they manage to maintain mobile and active. Gary Gygax, one of the co-creators of Dungeons & Dragons, has stated that he based the description of a lich included in the game on the short story The Sword of the Sorcerer by Gardner Fox[1][2].The term "lich", used as an archaic word for corpse (or body), is commonly used in these stories. Other imagery surrounding demiliches, in particular that of a jeweled skull, is drawn from the early Fritz Leiber story "Thieves' House".
In Roman Catholicism and the Church of England, the word "lychgate" refers to a covered area at the entrance to the cemetery where the casket awaits the clergy before proceeding into the cemetery for proper burial, "lych" being a word meaning body or corpse derived from Old English. In fantasy, the lich is an undead creature that was never buried in a grave. This is different from other types of undead creatures, such as vampires and zombies, which were buried and subsequently returned from the dead.
The underlying idea of eluding death by means of arcane study and black magic can be traced to Middle Eastern folklore, and the method of achieving immortality by placing one's soul in a jar (which is usually hidden in some vast fortress) is suggestive of the burial practices of Egypt. This would make the lich a very-far-from-its-roots mythologization of Egyptian pharaohs. (For the Ancient Egyptians, the purpose of the mummy was to provide a place for the soul to fly back to; it was free to exist in both the afterlife and the physical world [the latter to commune with its descendants].)
Eastern Slavic legends tell of a powerful dark wizard or a demon, Koschei the Deathless, who evades death by having his fiery soul placed in the eye of a magical needle. The needle is inside an egg, which is inside a duck, which is inside a hare, which is locked in an iron chest placed at the roots of a great oak tree on the magical island of Buyan. Koschei can be killed only by breaking the magical needle, which is much like the phylactery of a lich. This image is consistent with the modern interpretation of the lich, possibly marking it as the "truer" origin of the concept. In J. K. Rowling's Harry Potter, the villain, Tom Riddle, wanted to extend his life so split his soul into several parts, storing them in precious artifacts special to him, creating horcruxes. The horcruxes had to be destroyed before Voldemort himself could actually die. The horcrux is thus similar to a lich's phylactery.
In Roman Catholicism and the Church of England, the word "lychgate" refers to a covered area at the entrance to the cemetery where the casket awaits the clergy before proceeding into the cemetery for proper burial, "lych" being a word meaning body or corpse derived from Old English. In fantasy, the lich is an undead creature that was never buried in a grave. This is different from other types of undead creatures, such as vampires and zombies, which were buried and subsequently returned from the dead.
The underlying idea of eluding death by means of arcane study and black magic can be traced to Middle Eastern folklore, and the method of achieving immortality by placing one's soul in a jar (which is usually hidden in some vast fortress) is suggestive of the burial practices of Egypt. This would make the lich a very-far-from-its-roots mythologization of Egyptian pharaohs. (For the Ancient Egyptians, the purpose of the mummy was to provide a place for the soul to fly back to; it was free to exist in both the afterlife and the physical world [the latter to commune with its descendants].)
Eastern Slavic legends tell of a powerful dark wizard or a demon, Koschei the Deathless, who evades death by having his fiery soul placed in the eye of a magical needle. The needle is inside an egg, which is inside a duck, which is inside a hare, which is locked in an iron chest placed at the roots of a great oak tree on the magical island of Buyan. Koschei can be killed only by breaking the magical needle, which is much like the phylactery of a lich. This image is consistent with the modern interpretation of the lich, possibly marking it as the "truer" origin of the concept. In J. K. Rowling's Harry Potter, the villain, Tom Riddle, wanted to extend his life so split his soul into several parts, storing them in precious artifacts special to him, creating horcruxes. The horcruxes had to be destroyed before Voldemort himself could actually die. The horcrux is thus similar to a lich's phylactery.

This thread can also be linked with the Concept of Undead Armies. In many cases, undead armies are controlled by some kind of necromancer.
It is said that as necromancers become much more powerful, they eventually become something known as a lich.
Another way of a lich coming into being is the death of a necromancer or very powerful mage. In short, a lich is an undead sorcerer which in most cases is connected with the creature itself having once been a living necromancer.
The practice of necromancy involves the reanimation of the dead, whether it be zombies or skeletons. It can also involve sending evil spirits into inanimate objects. One example is the marionettes from Vagrant Story.
Unfortunately I can't find a picture. They're marionettes in the forms of little female dolls that carry knives. They wander around and rapidly attack you on sight, laughing a rather creepy little girl's laugh.
That's another consideration for necromancy. Sending a wicked spirit into such an object usually has a particular kind of motive behind it I believe.
That motive I think would be "what's going to put victims off and what's going to scare them?" I think dolls, puppets and children's stuffed animals are perfect candidates for such activities.

