Sri Kalki will be an avatar of Krishna the supreme Parabrahman who is also Shiva , Vishnu , Brahma and Ganesha because different section in hinduism named him like that. He will marry his heavenly consort Tridevi who she is also known Parvati , Saraswati and Lakshmi who is the Heavenly mother. He will then undertake the mission to complete the end of Kaliyuga and rid the world of all wicked kings and false prophets, evil people and to usher in the age of Armageddon.
“Lord Kalki, the Lord of the universe, riding His swift horse Devadatta and, sword in hand, will travel over the earth exhibiting His eight mystic powers and eight special qualities of Godhead. Displaying His unequalled effulgence and riding with great speed, He will kill by the millions those thieves and rogues who have dared dress as kings.” [SB. ]
0 Kesava, O Hari, who have assumed the form of Kalki! You appear like a comet and carry a terrifying sword for bringing about the annihilation of the wicked barbarian men at the end of the Kali-yuga.
[ Sri Dasavatara Stotra, 10th Sloka]
“There will be rulers reigning over the Earth who will think of themselves as modern and superior; they shall rule through leaders of nations, and these leaders shall be men of vulgar, corrupt disposition, having a violent temper, and ever addicted to falsehood and evil. They will inflict death on women, children and animals (through their wars and plagues); they will seize upon the property of their subjects; they will be however of limited and temporary power only as they will for the most part rapidly rise and fall in meteoric short careers; the lives of these leaders will be short, they will be physically and mentally ill from their insatiable desires and habits; and they will display but little of spiritual conscience.”
“The peoples of various countries, influenced by propaganda of their leaders, will follow the example of their leaders, and the Barbarians of materialism (in America and Europe) will be powerful in their patronage of the leaders of the less materially advanced countries; the more pure-minded and spiritual tribes (and social groupings) of their peoples shall be neglected and exploited so that those peoples shall be enslaved, suffer and perish in great numbers.”
“In all nations, wealth and spirituality will decrease day by day until the entire world will be corrupt, crooked and depraved. Then property alone will confer rank or high reputation; money will be the only object of devotion and dedication in people; the vicissitudes of physical sexual desire will be the only and fleeting bond of union between the sexes; women will be regarded as nothing but objects of sexual gratification; and falsehood will be the only means of success in litigation.”
“The natural Earth will be venerated only for it’s mineral treasures (such as oil); nothing but the Brahmanical thread in India will be said to make a person a Brahman; external clothing will be the only distinction of the level of evolution of human beings; dishonesty instead of genuine productive work will become the short-lived means of subsistence for people everywhere; weakness and irresponsibility will cause more and more people to depend on charity and the state wherever they can; political menace, conformity and intellectual presumption will be substituted for education; immorality and personal corruption will be the new false religion; mere external bathing and showering will be the substitute for internal purification; easily breakable mutual assent will be the only marriage vow of parents for rearing children and divorce with broken homes will ever increase; fine clothes and bodily physique will be the only human dignity; and only water in far-away holy places will be sacred, for the local water will be increasingly polluted.”
“Oh son of Bharata, whenever there is a decline of virtue and an insurrection of vice and injustice in the world; and thus I incarnate from age to age for the preservation of the just, the destruction of the wicked, and the establishment of righteousness.” ~Chapter IV bhagavad gita
The Vision of the Coming of the Messiah
11Then I saw heaven standing open, and there was a white horse! Its rider is named Faithful and True. He administers justice and wages war righteously. 12His eyes are like a flame of fire, and on his head are many royal crowns. He has a name written on him that nobody knows except himself. 13He is dressed in a robe dipped inb blood, and his name is called the Word of God. 14The armies of heaven, wearing fine linen, white and pure, follow him on white horses. 15A sharp sword comes out of his mouth to strike down the nations. He will rulec them with an iron rod and tread the winepress of the fury of the wrath of God Almighty. 16On his robe that coversd his thigh he has a name written:
KING OF KINGS AND LORD OF LORDS
The Vision of the Angel’s Invitation
17Then I saw an angel standing in the sun. He cried out in a loud voice to all the birds flying overhead, “Come! Gather for the great supper of God. 18Eat the flesh of kings, the flesh of commanders, the flesh of warriors,ethe flesh of horses and their riders, and the flesh of all people, both free and slaves, both unimportant and important.”
The Vision of the Judgment of the Beast and False Prophet
19Then I saw the beast, the kings of the earth, and their armies gathered to wage war against the rider on the horse and his army. 20The beast was captured, along with the false prophet who had performed signs on its behalf.f By these signsg the false propheth had deceived those who had received the mark of the beast and worshipped its image. Both of them were thrown alive into the lake of fire that burns with sulfur. 21The rest were killed by the sword that belonged to the rider on the horse and that came from his mouth, and all the birds gorged themselves with their flesh.