Cradle spans thirteen novels and one of the more intricate power systems in modern fantasy, cultivators advancing through named stages like Copper, Iron, Jade, and Gold. You'd expect an elaborate planning system behind it. Will Wight has said the opposite is true.

The Direct Answer
With minimum-viable outlines rather than exhaustive ones, plus plain notes files kept in the same folder as the manuscript instead of a dedicated story bible or wiki.
Wight has described his approach as figuring out the least he needs to know before starting, then fixing the rest during revision.

Plan the Minimum, Not the Maximum

Wight applies the same minimum-viable planning to Cradle's power system that he applies to plot, mapping only the next stage a character needs rather than the whole ladder from Copper to Sage in advance. Everything past that, in his view, risks becoming planning disguised as procrastination.

He's compared the first draft to a lump of clay, not a finished piece. "Anything that happens in the first draft can be fixed later," he's written, which is why he doesn't try to lock in every detail of a cultivation rank or a side character's arc before writing the scene that actually needs it. The system gets built, and rebuilt, in revision.

Piles of Notes, Not a Wiki

Despite the scale of Cradle's world, Wight has described his actual organization system as informal: text files saved next to the manuscript, not a dedicated worldbuilding database. "I have piles and piles of notes," he's said. "I just write everything down in a note file and save it in the folder with the main book manuscript." He's admitted this makes lookups inefficient and has joked about having to shovel through a mountain of notebooks to check a single character detail.

He's considered building a private wiki for the series and never quite gotten around to it. The books kept coming anyway, thirteen of them, which suggests the loose system was never actually the bottleneck. For more on how that planning philosophy fits into his wider process, see the full Will Wight writing routine.

What You Can Steal