Kaali Tantra

Mantras which are generally used in the rituals are nothing but the goddesses and originally started at the time of Satya yuga i.e. around 3.8 million years back these mantras cant be worked without a proper procedure which is the reason Lord Shiva revealed a path to Lord Parvathi that is appropriate to Kaliyuga which is tantra and in this kali yuga the procedure of getting involved by mantras in spiritual progress will be tantra.

The four gunas called Manas(Heart), Buddhi (thinking), Ahamkara (Proudness), and Chitta (Consciousness) should be in control while practicing the mantras in the tantra path.

Originally we had a lot of dimensions that we can't see without the awakening of kundalini and practicing mantras and the beejas in the mantras activate the kundalini and then the awakening of kundalini comes, by Tantric methods.

Tantra is one of the fastest methods that work in Kaliyuga.

Initially, around the 2-3 century Tantra ritual method evolved around the northern and eastern parts of India.

The oldest archaryas mentioned that at this age of Kaliyuga i.e from 3102 BC there is general degradation of human capacity and competency of the Gunas as there is corruption all around, because of this Vedic rituals that were there may not work at this time there have been changes in the atmosphere there are changes in the capacity of the people, lifespan has been reduced, there has been another argument that reveals people are not able to take prana(life) from the atmosphere, they take prana from the food this means if there is any corruption the food it is going to affect your mind, body, etc., there is a limitation put by nature due to which only some aspects of older rituals can be actualized and a large part of rituals can't be done, because of that out of compassion for humanity Lord Shiva revealed another path for general lower competency people of Kaliyuga. This validity came from Lord Shiva's mouth which is why it is valid.