Haoma is the sacred plant or tree in the Zoroastrian faith, as well as a Yazata ("Beings worthy of Worship"). The name also refers to the divinity of the sacred plant. The concept of Haoma has its origins in the Indo-Iranian Vedic religion and is a cognate of the Vedic concept of Soma, which also exists in Hinduism. Simurgh lives within Haoma's branches and when she leaves the tree she spread Haoma's seeds, which are then carried by the winds of Vayu-Vata and rain of Tishtoriya. Haoma's seeds then take root to become every type of plant that has ever lived, and curing all the illnesses of mankind.
"A Persian god of Zoroastrian origin who has a plant of the same name. He is the giver of life. The plant was originally a sacred plant used to make stimulants. Unfortunately, it is no longer known which herb that was. It was used commonly in religious rituals."
—Shin Megami Tensei IV Apocalypse compendium
Haoma can teach Nanashi the Amrita, Fog Breath, Blast Arrow and Tetraja skills through his Demon Whisper. He benefits from learning Gun, healing and support skills.
"A Persian god of Zoroastrian origin who has a plant of the same name. He is the giver of life. The plant was originally a sacred plant used to make stimulants. Unfortunately, the knowledge of which herb in particular this plant was has been lost to the ages. In previous era, it was used commonly in religious rituals."