What/who is Shakti?
Shakti means energy, power or force of the universe. The one with no beginning or end. Normally Shakti is depicted as a goddess. The goddess Adi Parashakti.
Adi is first
Para is transcending or great
Shakti is energy
Hence the first energy that is trancending.

Well let's see how is Shakti similar to a law in physics.

Physics law state that energy is not created, and never ends. It can't be destroyed. Yet it can be converted somewhere else.

Shakti isn't created.
Shakti is anantha
Shakti can't be destroyed. Because Shakti is over all, She can't bring defeated or destroyed. Shiva however is Her male counterpart. They are one. Shakti is also converted into many bodies. She converted(manifestated) as Sati, Parvati, Brahma, Saraswati, Durga, Vishnu, Lakshmi....and other heavenly beings.

Auras

Our bodies are vessels of translucent energy. But what are the adhyanmik view of it. Let's see the colours of aura and it's symbolism
There are red, yellow, orange, green and blue in that order. (We have layers like the earth if you think about it.)

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Read (Laal) is the core. It symbolises Agni and also Hanuman.
Yellow or Pitamabara is knowledgeable(Buddhi). This is Krishna.
Orange is Siddhi. It symbolises Ganesh and the Ved (The Vedas are mostly seen in an orange or red tint).
Green (Hari, Hara) this symbolises Vishnu (Hari) and Shiva(Hara)
And lastly, blue (Neela) symbolises the consciousness. Blue is a very deep colour like that of the conscious mind.