In the Towers of the Sun, the Depths of Shadow, We Dance

From the introduction:

When the energetic blood of the earth dried up, when we had burned all her bones, when we knew we needed the water to drink and grow and not for power, we turned our faces upward, to the Sun.

The Upper Folk lived in their high palaces, spread out like inverted wineglasses to catch the sun before the Underdwellers could; theirs were the shining discs of concentrators, where each person might claim acres of the Sun's power, concentrated in the glowing filaments that were theirs since birth.

Down below, those same filaments flickered, only sparks where the Upper Folk had torrents, and the power of the sun was hoarded, shepherded, and held by communities in common.

The Upper Folk have the sun at their beck and call; the Underdwellers have only their numbers and the skill of great patience.

Each do their own version of the Sun Dance, when mere humans turn into Avatars, channeling enormous power with great control, lest they fall from the skies in Overload.

Will the shining towers fall? Will the shadows melt away from the Underfolk? Or will that shadow remain a boot upon their faces?

That is for you, Upper Folk and Underdwellers, to decide.