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The stagnant, blank universe comes into contact with the Font of Creation.
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The rivers Oceanus and Styx form, along with the Seas of Calm and Unrest and the Eternal Void. The Outer and Inner planes delineate, and the immortal beings come into existence.
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The gods arrive in the center of the universe and create mortals. The Concurrent and Material Planes come into existence.
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The gods of Good, Evil, Law, and Chaos and their mortals wage war with one another in the material plane.
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The Arbiter rises to power and forges Sigil, City of Doors.
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Mortals form their own civilizations separate from--but still closely intertwined with--the gods. The wars continue, under the watch of the Arbiter.
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The deities of Good and Evil create the Great Weapons to end the war once and for all.
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The Material Plane, which has only known warfare, endures its largest battle yet as the Great Weapons are brought into play.
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The details of the fourth age are largely lost and greatly debated. The Great Weapons and the Arbiter both disappeared, and the divine realms were permanently separated from the Material Plane.