The dark green seed floating in Renji's palm, after absorbing Zera's consciousness, began to rapidly take root and sprout.
In the real world, there can only ever be one World Tree, but in the consciousness world of the mechanical servants, when Renji knelt down and buried the seed in the area where Zera had just disappeared, a luminescent sapling broke through the soil in a few breaths.
Zera's consciousness was the initial sprout, and then, from within the Consciousness Cube, the consciousnesses of countless other mechanical servants, as if attracted by the sapling, started flocking towards Renji's location.
For the mechanical servants, consciousness is essentially a set of data, and as Renji watched the electronic data being absorbed one by one by the green sapling before him, he couldn't help feeling a sense of dissonance, since plants and technology seem to be two entirely unrelated entities.