What is the Zoroastrian concept of the final renovation of the world?

The Zoroastrian concept of the final renovation of the world is Frashokereti.

The term comes from Avestan frašō.kərəti and is commonly understood as “making wonderful” or restoring creation. In Zoroastrian eschatology, the universe eventually returns to a perfected condition in which evil is destroyed and creation exists in unity with Ahura Mazda. This is not simply an apocalypse in the sense of total annihilation; it is a transformation and renewal of the existing world.

Later Zoroastrian texts describe the Saoshyant, a future savior, leading the final defeat of evil. The dead are resurrected, and a river or ordeal of molten metal tests and purifies humanity. For the righteous it feels like warm milk, while the wicked undergo purification before evil is finally eliminated. The doctrine connects cosmic renewal with personal moral responsibility: good thoughts, words, and deeds matter. Ragnarök belongs to Norse mythology, while Parinirvana is a Buddhist term for release from rebirth.