Board Thread:Questions and Answers/@comment-174.45.206.23-20130125044115/@comment-5319459-20130125220306

Crystals will spawn in Ages, that have the crystal symbol.

As you may know, when using Descriptive Books, ages are generated randomly. So you cannot guarantee that you will have an age with them in.

However, if you write your own Age with a Notebook and Writing Desk you can guarantee making a world with them in (providing you have added the crystal symbol to your notebook).