When King Kay Kavus at last found his heart eased of the world's endless turmoil, he turned his soul toward the Almighty Creator in sublime devotion. Bowing his head before God, he prayed: 'O Thou who art exalted above time and the cosmos, the eternal master of all good! Thou didst bestow upon me the Royal Glory, the throne, the crown, and endless treasures. I beseechingly prayed that Thou mightest raise a champion to avenge the innocent blood of Siyavash, and now I have beheld my own grandson, Kay Khosrow—a ruler adorned with wisdom, divine grace, and the noble customs of the ancient kings.' As the venerable monarch reached the age of one hundred and fifty years, his stature once straight as a cypress bent like a bow, and his raven locks turned white as camphor. Satisfied with his legacy, he welcomed the end of his mortal span, and ere long, his spirit took flight to the eternal realm.
Upon his passing, Kay Khosrow took the throne, and the entirety of Iran was plunged into profound mourning. Champions and noble lords divested themselves of all finery, walking barefoot and clad in deep black and azure robes for two full weeks. By the young king's decree, an elevated royal mausoleum—ten lariats in height—was constructed. The body of Kavus was cleansed and preserved with fragrant aloe, musk, and camphor, wrapped in royal Roman brocades and exquisite Dabiq silks, and laid upon a grand ivory throne topped with a crown woven of camphor and musk. Once Kay Khosrow bade his final farewell, the doors of the crypt were sealed forever, granting the old king eternal rest from war and vengeance.
Such is the inescapable order of this fleeting world; none abide here forever, nor can the wise scholar or the iron-clad warrior escape the clutch of mortality. Whether one be a mighty emperor or the Prophet Zoroaster himself, the ultimate bed is of dust and the pillow of clay. Earth becomes the final mattress, and the grave the last garment.
Kay Khosrow maintained solemn grief for forty days, keeping distant from all delights of the court. When the mourning period concluded, he ascended the magnificent ivory throne and placed the heart-brightening crown of the Kianians upon his brow. Assembled generals, mobads, and golden-helmeted magnates offered praises and showered priceless jewels upon his crown. A grand feast erupted across the entire world, signaling the dawn of a vibrant era of justice and jubilation under the reign of Kay Khosrow.