The One who is the darkness of the ShamaShana.
The One who brings light in the ShamaShana.
Kaalika stands at the very end of the figment of human imagination of Adi Sakthi. She is that last frontier a Jiva visualises in the ShamaShana. Before he merges into the great darkness, either for Re-Birth or Moksha.
Hence the name SHAMASHANA KAALIKA