Homebrew Primordial Age

Primordial Events
If you roll an 8 on the Primordial Events table, or if you just feel like it, you can use one of these new events:

Dyson's Revised Primordial Tables
By Dyson Logos at Dyson's Dodecahedron

Underground River
This table uses a d12 rather than a d10, and adds an underground lake.

Natural Caverns
Uses a d8 instead of a d6.