There are 8 unique codex entries in the Game Rules section provided when you create a character. They are accessible to all players regardless of class or faction.
Combat is obtained from creating a new character.
Codex type: Game Rules | Faction: Both | Class: All
Associated Achievement: None
Conversations is obtained from creating a new character.
Codex type: Game Rules | Faction: Both | Class: All
Associated Achievement: None
Group Content is obtained from creating a new character.
Codex type: Game Rules | Faction: Both | Class: All
Associated Achievement: None
Missions is obtained from creating a new character.
Codex type: Game Rules | Faction: Both | Class: All
Associated Achievement: None
Other Players is obtained from creating a new character.
Codex type: Game Rules | Faction: Both | Class: All
Associated Achievement: None
Phasing and Story Areas is obtained from creating a new character.
Codex type: Game Rules | Faction: Both | Class: All
Associated Achievement: None
Special Conditions Glossary is obtained from creating a new character.
Codex type: Game Rules | Faction: Both | Class: All
Associated Achievement: None
Status Effects Glossary is obtained from creating a new character.
Codex type: Game Rules | Faction: Both | Class: All
Associated Achievement: None