The city perched on the edge of the Positive Material Plane from whence the Seeds of Life are gathered
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"The City Forever lies on the marches of the Positive Energy Plane. While Gods gain their power from the Soul Harvest, the ability to focus that power and channel it back to their agents as magic comes from the Seeds of Life. These emerge from the Gates of Life and are collected by flickerships from the City Forever, to be released to the Gods through the Fortress of the Beating Heart in the midst of the city."
Under a roiling sky threaded with surreal streaks of dark cloud, the City Forever spread in an arc around the central chasm leading to the Edge. The architecture was magnificent, clearly conceived by beings of greater than human skill and aesthetics, the layout at once bold, spacious and elegant. And the whole place was neglected, decaying, dingy and disordered. Dirt and damage marred the buildings, debris and filth heaped at street corners, and slumped, furtive or guilty-looking figures moved through the grand streets. Grey rain fell almost constantly, cold and penetrating. The air was charged with a strange tension and sickly urgency.
Dominating all else was the incredible vista 'in front' of the city. In that direction lay the Positive Energy Plane, wellspring of all goodness and life, the essential power of Creation. Close to the edge was a vast nebular ball of glowing orange cloud streaked with flame - the Gates of Life, from which the Mystery of the Seeds of Life emerged, to fall back into the Positive Energy Plane unless harvested. That harvesting was done by the denizens of the City Forever riding strange flying ships called flickerwings.
The effect on celestials of constant exposure to this much positive energy is very similar to that of hard drugs on humans, with the result that the City Forever resembles nothing so much as a stoner commune populated with angels.