Realmbreaker was New Phyrexia's answer to the limits of planar travel. Its branches opened stable breaches across the Multiverse, allowing troops, war machines and oil to arrive in living worlds. What had once required a planeswalker spark became a military network under Norn's control.
The compleated planeswalkers led assaults where their knowledge could do the most damage. Nahiri turned Zendikar's ancient structures toward Phyrexian ends. Tamiyo attacked Kamigawa with stories made into weapons. Ajani targeted the faith of Theros, while Atraxa descended on New Capenna and Lukka tried to dominate Ikoria's monsters.
Norn saw this as proof of unity: every army receiving one purpose, every conquered person remade into another instrument. Yet the invasion contained the flaw that would destroy it. A system centred on one will could spread quickly, but it had little room for doubt, adaptation or the value of anything it had not already understood.