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Even though the Necromancer Tower had destroyed all other magic towers in the Northern Continent, it didn't mean they destroyed all lives. There were many families who had risen during the chaos while supporting the Necromancer Tower.
Each of those families were rewarded with territories of their own. While the real ruler was still the Necromancer Tower, the families were allowed to manage the land for the Necromancer Tower.
With all the resources of their territories being monopolized by them, the families prospered even more.
Even as they sent most of the resources to the Necromancer Tower, they were able to save enough to become stronger.
The families that were like ants before other magic towers, were now comparable to them in strength. There were even some families that had grown stronger than what used to be the Wind Magic Tower of the past.