Kshathra is one of the great Principles exalted by Zarathushtra, and is numbered among the Amesha Spentas, the "Bounteous Immortals" who are the personified attributes of God in Zoroastrian theology. Kshathra means "Dominion," or "Power," and it is also translated as "Kingdom."
The Zoroastrian tradition presents Kshathra as moral, political, and theological.Kshathra is often referred to as vairya, or "chosen." This phrase of "Kshathra vairya" became, in later Persian, "Shahrivar," and it is by this word that modern Zoroastrians refer to Kshathra. The idea of a "chosen Dominion" emphasizes that the righteous moral life is one of CHOICE. In Zarathushtra's, and later Zoroastrian moral theory, human beings must actively choose the Good. They are not destined to be good or evil by the karma of previous lives, nor by God's predestination or inscrutable Fate. Choice is the root of all human power - humans can choose to follow the way of ASHA or righteousness, and build up God's world, or they can choose to be indifferent or even evil, acting to destroy God's world. This power of Choice is the moral essence of Kshathra. In this sense, Kshathra refers to your personal power, something which every conscious person has - the power to say yes or no, the power to create or hinder or damage. In the Zoroastrian view, no one is powerless. God's Kshathra reaches everyone, and in exercising personal power by choosing to do good things, human beings are acting in union with God.