Origin story
Karinkali is honoured as Bhadrakali in her darkest aspect. At Kannenkavu in Malappuram, the Karinkali Pooram gathers ritual dancers painted black, embodying the goddess's furious power and her protection of the village.
The black colour, the sword and the wild dance express the dissolution of fear. Devotees approach her for protection from enemies, illness and misfortune, and the fierce form is understood not as cruelty but as the courage that stands between the community and harm.
Source: Wikipedia: Bhadrakali — https://en.wikipedia.org/wiki/Bhadrakali