a). Pacify sickness, hindrances, and troubles.
b). Increase life, good qualities and wisdom.
c). Attract whatever Dharma practitioners need and bring people to the Dharma.
d). Destroy confusion, doubt, and ignorance.
In addition to the ubiquitous skull cup and chopper, the Chatur-bhuja Mahakala holds in his other two arms a khatvanga (left hand) and flaming sword respectively. The khatvanga is a kind of ritual staff having human heads at the upper end. These represent the overcoming of the roots of evil, namely greed (raga), ill will (dvesha), and delusion (moha).
The sword is the flaming weapon of transcendental wisdom (prajna) with which Mahakala destroys ignorance. The latter is the principal attribute of Buddhist deities especially associated with overcoming ignorance and embodying the wisdom aspect of enlightenment within their physical forms.