The authorship of the Tantras is to Lord Shiva and shakti

Who is believed to have granted this knowledge to his Power ….Shiva to his Shakti..... She... in turn.... made them available to mankind.... Original Tantras  chosen for worship Shiva, and Shakti......

 

ShivaShakti..... as a union of two inseparable qualities...... all living beings.... which will follow later,..... are parts or sparks from this ShivaShakti..... This state of Tat.... or ShivaShakti.... is without any sound,..... and thus 'before the AUM.... that will follow later....  It is important to know that this state..... is not something that happened in the past. ….This state is always there...... as it is present in each and every one of us...... We just do not realize it at this moment... Shiva and Shakti start to 'separate'...... When we talk here about Shiva and Shakti ...in the third person tense.... it is because our present day consciousness perceives this as such..... So actually we are talking about our consciousness.... that started to perceive itself ...as two separate qualities..... In what follows.... it is actually our consciousness.... which starts to see itself in multiples.... although, for convenience sake we will continue to talk.... as if these qualities are outside ourselves......  So at one point... Shiva becomes pure consciousness.... and stays 'behind'... in its divine realm.... while its counterpart Shakti.... becomes the 'form of consciousness'..... Shakti is also called a vritti....a thought wave of Shiva.... that by itself does not have any characteristic..... Shakti in this state is a form of bliss..... Again this is a description limited by human language ….and does not adequately reflect their true state......