Slaying of Keshi and Vyomaasura
Keshi was a mighty demon, whose appearance was that of a wild horse. Like all demons, he can take any form, but the horse form was his natural one. When he went to battle, he took this form, and no one on earth had the power to even stand against such a mighty horse with powerful hoofs. Even the Devas would tremble, when Keshi whinnied his war cry. Kamsa knew what Keshi could do, but he also knew what Krishna could do to demons like Keshi. Yet, he was not averse to the idea of sending Keshi to Krishna. This wicked Asura, even though he had assumed the form of a Gandharva frightened all the worlds with his fierce voices. the way he stood on his hind legs and waved the hooves made everyone run hear and there in fear and tears.
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Krishna saw the demon Keshi the Horse and went straight to a whinnying Keshi and took the fighting posture. With a terrifying war cry, Keshi came thundering down on Lord Krishna, in an intention to trample him. But, Lord Krishna decided to punish the horse,and jumped away and caught hold of Keshis hind legs. , and placed his strong club like arm into his mouth. At that time the arm increased in size and choked the horse to death. Even though the Asura was in the form of a horse, he attained oneness with Krishna.By killing that horse (the sacrificial animal in the Aswamedha Yajna), Krishna perform a new kind of Aswamedha (shorn of its rituals). The celestials, in their delight at Thy deed, praised Krishna by Thy new appellation, "Kesava" (slayer of Kesi.
Kamsa never grew tired of sending demons after demons in attempts to kill his nephew, Lord Krishna. But, none of the demons came back alive. They never came back at all. Every one of them was killed either by Krishna or Balarama.
One day, Kamsa sent a demon, by name Vyomasura. This demonic character had a special power. Normally he appeared as a harmless bat, but when he decided to create trouble, he would enlarge his body a million times. Then he would kill and wreck havoc. He even had the habit of drinking the blood of his victims.
Vyomasura went to Vrindavan and hid in the mountains. Krishna and his friends used to go daily on that way, as the cows found good pasture in that area. Once the cows were put to browse on the grass, Krishna and his friends would start to play. That day, while they were playing Lambs-Thieves-Guards, Vyomasura deceitfully kidnapped the unassuming friends of Krishna, one after another, and put them inside a cave. He then sealed the cave with rocks.
Lord Krishna sensed this and rushed to the cave. There, the bat demon was just lying on a rock at the entrance. Krishna took him and held him in his firm grip. Vyomasura initiated his gigantic form and tried to grow. But, Krishna held him more firmly and consequently Vyomasura was choked.
As Vyomasura gasped for breath, Krishna released him and then there was fierce battle between the two. At the end, Lord Krishna threw Vyomasura down on the ground and killed him. He then released all his friends from that cave.