Ashoka: Journey Thought Myths

An unknown warrior

I was in air or if i say i was air, i had no body but i could still see, hear and smell. The gods and the Demons were fighting, there were millions of soldiers from both sides.
I saw the god of Fire Agnidev burning Demons with flames until a Arrow came out of nowhere and hit him, he teleported from there to the camp back, so many Gods were injured even after how powerful they were. 
And i didn't know how but every face i saw i could recognize it as i knew them, Ganesha and Kartikeya both brothers were fighting Shumbh and Nishumbh. 
Shumbh sent an army or Asura at Kartikeya's side. The dark clothed horned creatures were coming towards Kartikeya he summoned his Vel the mighty spear of his and threw it, in just one blow he killed all those thousands of Asuras, on the other side of the battlefield Shukracharya the Guru of Demons unleashed a creature of nightmares , a serpent with ten heads and no tail and fighting it were the God of Sun SuryaDev and the god of moon ChandraDev .
But from the Demons side there was a figure coming towards battle, riding on the wind and coming as the darkness, swiftly yet dangerously, than i saw his face.
It was my father or the face of my father as I've seen it, but this was dark and as though the rage itself have impersonated in a body.
His sword cut thought the soldiers of Devsena (army of gods) as if it was air. He aimed it at Kartikey , the God of war was ready. As Kartikey so the sword coming at him, he sent his Vel. 
Both were weapons of massive power and as the calashed the impect was so Powerful, even the earth couldn't stand it, both sides Demons and Devas faced it, the impect only was able to kill tens of thousands of warriors of both sides.
Two Shivansh (born from shiva) faces each other. The king of Demons was a Shivansh i knew now as he summoned a weapon, as the sky teared apart and forged a blade on the other side the ocean rose and rose, then fell , leaving behind another blade. At his command both blades came together making a Double Edged sword, blazing at one side and cold as snow on other.
Kartikeya knew what was coming to him, Weapon that could destroy even him but he did not yield and stood there as his opponent sent the Dual Edged Sword directly to him.
But before it could reach Kartikey,a figure came between them, a body formed from air.
A man wearing snake as ornament, throat blue as the ocean, a face with three eye's, the Third being at his forehead, young in looking but old as the universe or even older, Trishul (Trident) in hands pellet drum attached in it. 
My father has come to save Kartikeya, as the duel edges Sword was still coming Shiva opened his Third eye, the sky turned red and the earth dried, a supreme and Divine energy beam shot from his eye, clashing with the Sword, every person on the battlefield died from the impect and Gods or Powerful Demons who were left alive flew. 
The Demons ran to Patal Lok ( region of Demons) and Devas ran to the Dev Lok( region of Devas). As the Devlok was in sky i could still see them, everyone was watching as Shiv faced Shivansh. Even Kartikeya and Ganesha came to the skies.
Who was this Shivansh ?