Al-Lat was one of three main idols alongside al-'Uzza and al-Manat worshipped by the people of Mecca before the message of Islam was spread by the prophet Muhammad. Its origins are traced from the traditions of Sumerian civilization brought to pre-Islamic Arabia by merchants and nomads who idolized stones in their daily life. In one instance, it is regarded as a goddess, and had a son Dusura, who was idolized by the people of Petra in ancient Jordan. Alilat is associated with the morning star, which is also associated with Venus.
Alilat appeared as a rare boss spawn in the 2014 Nightmare Ride Show event instance. Defeating her allowed players a chance at obtaining the ability to fuse her in a special triple fusion of Hecate, Artemis and Parvati. She reappeared as one of the two bosses in the Kappa and the Lost Utopia event later that year, spawning in the Yodobashi Underground in the shrine across from where Albion spawned. Like Artemis, she possesses the Moon Goddess feature that significantly boosts synthesis success rates.
"The Arabian mother goddess also known as Allat. She was thought to reside in the Black Stone at the Kaaba. She and her son, Dusura, were worshiped there by desert nomads."
—Shin Megami Tensei: Strange Journey compendium
She appears as the single demon of the Geist race and as a powerful boss in Sector Grus in a New Game Plus EX Mission. In that capacity, she serves as the lock holding back the power of the Demiurge, who is seeking to reassemble itself. She possesses several highly damaging attacks such as Megidolaon, and can charge it up with Mind Charge for complete wipeouts, or even use Diarahan to fully restore herself to full health.
As she lies dying, she fervently whispers "he," even with the lock shattered, cannot do anything to avert the revival of the "goddess-worshipping world he once trampled." This is but one of the many times the game implies the angel both requesting Alilat's death and the destruction of Demiurge is YHVH and the reason for the enmity between the Mothers of the Schwarzwelt and the forces of Law.
Upon her death, her skull, the Rare Forma Nabatea Stone, can be used to create Scanning Zero, one of the game's last SubApps. Her special fusion is also unlocked, which consists of Peri, Azrael and Israfel.
"The Arabian mother goddess also known as Allat. She was thought to reside in the Black Stone at the Kaaba. She and her son, Dusura, were worshipped there by desert nomads."
—Shin Megami Tensei IV Apocalypse compendium
Alilat can be summoned in the Cathedral of Shadows through a special fusion of Peri, Azrael and Israfel once Nanashi can control level 84 demons. She can teach Nanashi the Diarahan, Megidolaon, Concentrate and Makarabreak skills through her Demon Whisper. Alilat benefits from learning Almighty, healing and support skills.