The main task of the Guild of Writers was to write links to Ages, though many upper-class D'ni also knew how to write. Those who did not have the opportunity to learn to write Ages could visit the Ages whose books were kept in the Common Libraries.
Types of Ages
Ages written by the D'ni were often specialised for a particular purpose, such as producing food, or storing Linking Books for easy access.
- Burial Age: an Age written for the burial of D'ni's dead. Usually Guild Ages owned by the Minor Guild of Burial Workers.
- Food Age: written solely for the purpose of growing food. Usually Guild Ages owned by the Guild of Caterers.
- Garden Age: written specifically for rest or relaxation. Also known as Rest Ages.
- Lesson Age: an Age written to teach the Art.
- Library Age: an Age written for the easy access of many Linking Books.
- Marriage Age: an Age used for D'ni marriage ceremonies, on the Day of Joining.
- Mining Age: used for mining resources. Ages of this type were usually owned by the Guild of Miners.
- Prison Age: an Age where a criminal was imprisoned forever, without a linking book back.
- Death Age: a rare type of Age which would instantly kill anyone linking in, used as capital punishment for particularly severe crimes.
- Research Age: written for research, observation, or education. Not to be confused with a Lesson Age.
- Sport Age: an Age used for recreational purposes. Also known as Recreation Ages.
- Guild Age: an Age that was owned and used by one of the Guilds.
- Private Age: an Age written for private use by a person or family. Also known as Personal Ages. Ages owned by families are also known as Family Ages.
- Public Age: an Age which was publicly available in a Common Library or the Nexus, for the general D'ni public to enjoy.
- Illicit Age: Ages that went against the laws of the Guild of Writers, and hence were illegal in D'ni. From 4305 DE (3352–3351 BCE) onwards, the writing or trading of illicit Ages was punishable by permanent imprisonment on a solitary Prison Age.
- Inhabited Age: any Age that has a civilization living in it. In the context of the D'ni Civilization, the term was generally used to describe an Age which already had a civilization living there before a link was written there.
- Instance: an apparent duplicate or near-duplicate of another Age, created by the Bahro or Yeesha and usually linked to via a Bahro Stone.