Gisa - Can't maintain zombies forever

But the threat was also the source of raw materials with which to expand her army, and not being—ugh—a stitcher like her blighted brother, may he be consumed by boils and burdens of the living flesh until he surrendered himself to the merciful embrace of death itself, she couldn't put her creatures back together once they reached a certain level of damage. Their flesh rotted much more slowly than it would have done in the ground, without her borrowed vitality to sustain it, but it still rotted. Limbs dropped away. Jaws loosened; teeth left their sockets. She could hold the city for now, while her legion was strong and her rule unquestioned; she couldn't hold it forever.

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THE DANCE OF UNDEATH