Anahita, also known as Aredvi Sura Anahita, is a lesser yazata from Zoroastrianism. She is identified with the Aban or the waters and is thus a river deity responsible for fertility. She was worshiped as part of those duties. She rode in a chariot driven by four horses and was benevolent to those who worshiped her and stern to those who did not. She was both the god of and the source of the world river.
She tended to be conflated with the Semitic goddess Ishtar or the Gathas Ashi.
"Goddess worshipped in Zoroastrian and Persian lore. Her name translates to "pure" in Avestan. She takes the form of a beautiful maiden, and is mainly revered as a divinity of water. However, she is also thought to be a goddess of fertility, blessing health, child birth, cattle and even wealth."
Anahita is the boss of the First Sphere of the Womb of Grief. Her skill set is predisposed towards Ice, sporting attacks like Bufudyne and her signature Hellish Spurt which hits random targets for ice damage.
While normally a straightforward boss fight, once she falls to half health, she unleashes Cocytus, which boosts the strength of her attacks and prevents Fire attacks from working while it's active. When this happens, her weakness to Fire can't be exploited for Co-Op attack damage, so play defensively and switch to basic attacks until it passes.
After Anahita's defeat, Demeter shows up and tells her of the Harvest. Anahita gives the protagonist the first Fruit, opens up the path to the second Sphere, and becomes available for fusion. The protagonist also finds the Damp Hair forma, which forms the Co-Op Enhance R Sub-App, allowing Co-Op attacks to trigger on another target if a weakness-hitting attack kills its target.
"A Zoroastrian goddess whose name means "pure." While primarily known as a beautiful deity who rules over rivers and water, she is also the goddess of health, fertility, safe delivery, production of livestock, harvest, wealth and expansion of land. She is often portrayed as an elegant virgin wearing a crown decorated with numerous stars in addition to a golden necklace and a golden cape, and is typically shown holding a water jug. She is also a brave god of war astride a four-wheeled chariot, toppling demons and tyrants alike. Both her allies and her enemies have been said to have offered their prayers to her."
—Shin Megami Tensei V lore
Anahita can be found on at a spring in Onarimon, reached by jumping a ledge across a chasm to reach the side of the mountain he resides on. A Mermaid asks the protagonist to seek her out after defeating Pazuzu fails to dispel the curse he placed on her companions. When found, Anahita states that she can can lift the curse as the protagonist requests, but asks that he indulges her love of battle in return. During battle, Anahita will broadcast her use of Hellish Spurt by activating Omagatoki: Critical the turn before. After defeating her, she gladly washes away the curse afflicting the Mermaids and offers to join the protagonist at any time, becoming unlocked for fusion after she leaves.