The autumn festival, or Sharodotsab, ends with Kali Puja and Diwali centring around worship of Mother Goddess Kali.
Kali Puja, also known as Shyama Puja or Mahanisha Puja, is a festival dedicated to the Hindu goddess Kali, celebrated on the new moon day (Dipannita Amavasya) of the Hindu month Kartik.
Wherein Durga Puja, the ten-handed deity is the goddess of protection and progression; Kali is the goddess of destruction, the other side of the cycle of the creation concerning cosmic law of constant transformation. 
The ferocious Goddess is depicted with disheveled hair, wearing a garland of skulls and holding a demon’s head in one hand and a weapon on the other.