Kali. Seated on a corpse, greatly terrifying, laughing loudly, with fearful fangs, four arms holding a cleaver, a skull, and giving the mudras bestowing boons and dispelling fear, wearing a garland of skulls, her tongue rolling wildly, completely naked (digambara - clad in the directions), thus one should meditate on Kali, dwelling in the centre of the cremation ground.
The Kali Mantra as given