Kalyuka is a term from Hindu philosophy that refers to the fourth and final age in the cycle of Yugas. It is characterized by a decline in virtue, morality, and spirituality among humanity. In this age, people are believed to be more materialistic and less connected to their spiritual roots. The concept of Kalyuka is often associated with the idea that it brings challenges such as conflict, dishonesty, and a general loss of righteousness. Despite these difficulties, it is also seen as a time for potential growth and learning, as individuals navigate the complexities of life in this age.