Dominaria entered the dark climate created by the blast. Civilisations adapted, migrated or failed, while stories of Urza and Mishra hardened into legend. The Shard of Twelve Worlds limited planar travel around the region, isolating worlds during an age whose inhabitants had no part in the decision that caused it.
Urza focused on Phyrexia. He built academies, created Karn, manipulated bloodlines and designed the Legacy as if enough preparation could redeem the scale of his first failure. His hatred was grounded in a real threat, but revenge also allowed him to keep using the logic of the war: every life could become a resource if the final objective was important enough.
Thousands of years later, Teferi returned to the moment of the Sylex blast to learn how a replica might stop New Phyrexia. History offered no clean instruction manual. It offered a warning that the weapon required a person to channel a world’s pain—and that solving the present by copying Urza also meant confronting what his solution had cost.