Navadurga
The nine forms invoked over Navaratri - Shailaputri, Brahmacharini, Chandraghanta, Kushmanda, Skandamata, Katyayani, Kalaratri, Mahagauri, Siddhidatri.
The supreme Goddess; the invincible warrior-mother who slays evil and the very power (Shakti) by which all action happens.
Who Durga is
Durga is the Great Goddess - Shakti, the dynamic power of the Absolute, worshipped in the Shakta tradition as the supreme reality herself. She is the warrior-mother, riding a lion, who destroys the demons no god could defeat, and the loving Amba who nurtures her devotees. Her deeds are told in the Devi Mahatmya (Durga Saptashati).
What Durga embodies
She is Shakti - the creative, sustaining and dissolving energy without which Shiva (consciousness) is inert. “Durga” means the impassable fortress: she is the power that overcomes every difficulty (durga) - ignorance, ego, and the inner asuras of lust, anger, and pride.
When the buffalo-demon Mahishasura, unslayable by any man or god, drove the devas from heaven, the combined fury and radiance (tejas) of all the gods streamed forth and coalesced into a single blazing woman - Durga. Each god gave her his weapon: Shiva his trident, Vishnu his discus, Indra his vajra, and so on. Mounted on a lion, eighteen-armed, she met Mahishasura in battle and, after he shifted shape between buffalo and man, beheaded him - Mahishasuramardini, “slayer of Mahisha.”
When: Eternal Adi-Shakti; her Mahishasura victory is the heart of the Devi Mahatmya cycle.
Consort
Shiva (as Parvati, her benign form).
Children
Ganesha and Kartikeya; Lakshmi and Saraswati are honoured as her daughters in the Bengali Durga Pooja tableau.
Vahana (mount)
The lion (or tiger) - dharma-power, fearless will.
Radiant, many-armed (eight or eighteen), each hand bearing a god’s weapon - trident, discus, conch, bow, sword, thunderbolt, lotus - riding a lion, serene-faced even as she spears the demon Mahisha at her feet. Adorned and golden, she is fierce in battle and gentle to devotees.
The nine forms invoked over Navaratri - Shailaputri, Brahmacharini, Chandraghanta, Kushmanda, Skandamata, Katyayani, Kalaratri, Mahagauri, Siddhidatri.
The lion-riding slayer of the buffalo-demon - her defining victory.
The fierce, time-devouring form that ends all illusion.
The compassionate mother-aspect.
The ten tantric wisdom-goddesses, aspects of the one Devi.
Mahishasura’s boon made him invincible to all males; so the Goddess - neither god nor man - was born of their united power to end him, teaching that arrogance founded on a loophole always meets the force it forgot.
When the demon Raktabija multiplied from every drop of his spilt blood, Kali emerged from Durga’s brow to drink the blood before it touched earth, while Durga slew the body - ego that regrows from its own indulgence, cut off at the source.
ॐ दुं दुर्गायै नमः
Om Dum Durgayai Namah
The Durga bija-mantra - protection and strength.
या देवी सर्वभूतेषु शक्तिरूपेण संस्थिता। नमस्तस्यै नमस्तस्यै नमस्तस्यै नमो नमः॥
Ya Devi Sarvabhuteshu Shakti-rupena Samsthita / Namastasyai Namastasyai Namastasyai Namo Namah
From the Devi Mahatmya - saluting the Goddess as the power within all beings.
Worshipped over the nine nights of Navaratri with the Durga Saptashati, red flowers and vermilion (kumkum), the kalasha sthapana, and kanya-puja. Red hibiscus and the chanting of the Argala/Kilaka stotras are central.
The teaching
The power to overcome every obstacle is already within you - Shakti is your own energy, rightly turned. Durga teaches fearless action in defence of dharma, and that the demons truly worth slaying are the inner ones: ego, anger, and craving that regrows from indulgence.