Lilith was originally a storm demon known as "Lilitu" in ancient Mesopotamian myth around 3000 BC and she was thought to have been the cause of disease, illness, and death. She later appears as a nocturnal demon in Jewish lore.
In Judaism, Lilith was the first wife of Adam, however she was cast out of the garden of Eden for her sinful ways. In this tale, she was the first to eat of the fruit of knowledge and wanted to be either equal to or greater than Adam. After she left the garden of Eden, she attempted to create her own garden and became the consort of many different demons, including the fallen angel Samael, and bore many succubi known as the Lilim. Meanwhile Adam grew lonely, and beseeched God to forgive Lilith and return her to Eden. God told Lilith that if she did not return, he would punish her by taking away her children. She refused, her children were taken, and since that day she has become a demoness at war with the sons and daughters of Adam, targeting children in specific.
Another version of the story as told in the 'Midrash Abkier', is that after Cain's homicide brings death to the world, Adam separates from Eve and fasts for 130 years. When the demoness Lilith (also known as Pizna) saw his beauty, she instantly desired him, and took him by force by using his own sin against him. She bore him many demonic spirits known to be a plague to mankind.
Lilith is the highest level Night demon which can be obtained by evolving a Lilim or contracted in the upper levels of the Tower of Kagutsuchi. In the original version's Debug mode, there is a cutscene involving Lilith opening an optional dungeon near the Mantra HQ. This dungeon was dropped in favor of the Labyrinth of Amala.
The NPC known as the Shadow Chaser is strongly hinted to be Lilith helping the player to unleash Beelzebub's full potential in the Lord of the Flies quest chain. After completing this quest, players gain the ability to fuse her as a special triple fusion of Vetala, Succubus, and Lilim.
"Adam's first wife in apocryphal Biblical scripture. She became a demon after leaving Eden. Adam's wife Eve, according to popular belief, is born in Genesis 2:22. However, in Genesis 1:22, because it says God created woman there, it is believed this is Lilith. Although she is often depicted as a symbol of infidelity, she originally was a Babylonian goddess. According to one legend, she is Samael's wife and was the one who sent the snake at Eve, and is usually depicted with snakes."
—Shin Megami Tensei IV Compendium
Note:Significant plot details follow.
In Shin Megami Tensei IV, Lilith turns out to be the true identity of the Black Samurai, also known as Lady Yuriko. If Flynn sides with Walter, Lilith becomes an ally and is unlocked for fusion. If Flynn sides with Jonathan, however, she must be fought as a boss (and is not unlocked for fusion). On the Chaos route when Flynn regains access to the Eastern Kingdom of Mikado, she will appear briefly at the Monastery before disappearing.
"Welcome to my boudoir, Mr. Cursed Summoner. I could have a use for you... But if you're hanging around with that girl, then you must still be a little boy. Now, come... I'll show you what a real woman can do."
—Lilith, Devil Summoner: Soul Hackers
Lilith appears in the third Room of Trials at the Corridor of Time. Defeating her is necessary to obtain the Copper Manji.
Devil Summoner: Raidou Kuzunoha vs. the Soulless ArmyEdit
"Adam`s first wife in apocryphal Biblical scripture. She became a demon after she left Eden. There are several theories as to the reasons for her fall, but all note her unfaithfulness."
—Shin Megami Tensei: Devil Summoner: Raidou Kuzunoha vs. the Soulless Army Devil Chart
Lilith appears as the Persona of the Devil Arcana in Persona 3. Her fusion prerequisite requires the protagonist to complete Elizabeth's 48th request, which grants the protagonist a key item to fuse Lilith. Lilith's fusion prerequisite requires the protagonist to perform a Cross-Spread Fusion in the Velvet Room using Lilim, Vetala, Incubus, and Succubus.
"Adam's first wife in apocryphal Biblical scripture. She became a demon after leaving Eden. There are several theories as to the reasons for her fall, but all note her unfaithfulness."
—Devil Survivor 2 Compendium
Lilith appears as a bonus boss on the 4th Day in the Original Wife event. She is seen at the 'Valgate in Osaka, having charmed several men controlling overleveled female demons and sending them to fight the player. Because the men are fighting under Lilith's mind control, the player has to defeat Lilith without defeating any of the charmed men.
Lilith possesses a unique racial ability limited to this fight only: Temptation. At the start of a skirmish, Temptation activates and attempts to charm the opposing team. It always works against male team leaders (unless they have Null Curse), and has a moderate chance of success against anything else. Fully utilizing Null Curse on the team(s) attacking Lilith can protect against this while netting Extra Turns.
Defeating Lilith earns the player the Spell Breaker title and the ability to fuse her in the Cathedral of Shadows.