The fifth aspect of the Mother Durga is known as ‘Skanda Mata’ – the mother of Skanda or Lord Kartikeya, who was chosen by gods as their commander in chief in the war against the demons. She is worshipped on the fifth day of Navaratri. She is accompanied by the Lord Skanda in his infant form. Skanda Mata has four arms and three eyes, holds the infant Skanda in her right upper arm and a lotus in her right hand which is slightly raised upwards. The left arm is in pose to grant boons with grace and in left lower hand which is raised also holds a lotus. She has a bright complexion and often depicted as seated on a lotus.
The sixth form of Mother Durga is known as ‘Katyayani’, who is worshipped on the six day of Navaratri. The legend behind her name goes thus: Once upon a time, there was a great sage called Kata, who had a son named Katya. Kata was very famous and renowned in the lineage of saints. He underwent long austerities and penance in order to receive the grace of the Mother Goddess. He wished to have a daughter in the form of a goddess. According to his wish and desire the Mother Goddess granted his request. Katyayani was born to Kata as an avatar of Durga.
The seventh form of Mother Durga worshipped on the seventh day of Navaratri is known as ‘Kalratri’. She has a dark complexion, disheveled hair and a fearlessness posture. A necklace flashing lightning adorns her neck. She has three eyes that shine bright and terrible flames emanate from her breath. Her vehicle is the donkey. Her raised right hand always seems to grant boons to all worshippers and all her right lower hand is in the pose of allaying fears. Her left upper hand holds a thorn-like weapon, made of iron and there is a dragger in the lower left hand. She is black like Goddess Kali and holds a sparkling sword in her right hand battle all evil. Her gesture of protection assures us of freedom from fear and troubles. So she is also known as ‘Shubhamkari’ – one who does good.
Maha Gauri is worshipped on the eighth day of Navaratri. Her power is unfailing and instantly fruitful. As a result of her worship, all sins of past, present and future get washed away and devotees get purified in all aspects of life. Maha Gauri is intelligent, peaceful and calm. Due to her long austerities in the deep forests of the Himalayas, she developed a dark complexion. When Lord Shiva cleaned her with the water of the Ganges, her body regained its beauty and she came to be known as Maha Gauri, which mean extremely white. She wears white clothes, has four arms, and rides on a bull. Her right hand is in the pose of allaying fear and her right lower hand holds a trident. The left upper hand holds a ‘damaru’ (a small rattle drum) and the lower one is in the pose of granting boons to her devotees.
Siddhidatri is the ninth form of Goddess. She is worshipped on the ninth day of Navaratri. Siddhidatri has supernatural healing powers. She has four arms and she is always in a blissful happy enchanting pose. She rides on the lion as her vehicle. She blesses all Gods, saints, yogis, tantrics and all devotees as a manifestation of the Mother Goddess. In ‘Devi Bhagvata Purana’ it is mentioned that Lord Shiva worshipped her and was blessed with all Siddhis (supernatural powers). By her blessings his half body became female and other half body male in the avatar of Ardhnarishvara.