I'll start with something:
- Linking is only able from books in the start, as time progresses, machines/computer screens that provide a link may be available, but not primarily
- Descriptive books contain both the description of the age, and an initial link
- Linking books are available in two flavours:
- Reference linking books refer to a descriptive book, through certain special phrases that are similar. They do not need to be written in the age itself. A special offset (link in point) in the target age may be written, but this is very tricky and error-prone. If written in the target age itself, they will link to the place in which the linking book is written. If the descriptive book changes or is destroyed, these books will fail to function, or follow the descriptive book's link.
- Direct point linking books are not bound to a descriptive book, but are written in the age they link too, and link to the spot in which they are written. If the descriptive book for the age is changed, it does not affect the link these books make, as they have no reference to the descriptive book.
- No linking "Magic"! - Linking zones, spirals, etc are off-limits, unless properly explained.
- Certain ages may have natural objects that have linking (or link enhancing) properties of some kind. (Like the Rime stones, or Katran's panel enhancement stones)
- Some books may need to be powered, like Gehns
Comments please...