There are 7 unique codex entries in the Persons of Note section on Oricon. 5 are accessible to all players regardless of class or faction and 2 are faction specific.
Dread Master Bestia is obtained from interacting with a Clickable Holocron.
Codex type: Persons of Note | Faction: Both | Class: All
Associated Achievement: Loremaster of Oricon
Dread Master Brontes is obtained from interacting with a Clickable Holocron.
Codex type: Persons of Note | Faction: Both | Class: All
Associated Achievement: Loremaster of Oricon
Dread Master Calphayus is obtained from interacting with a Clickable Holocron.
Codex type: Persons of Note | Faction: Both | Class: All
Associated Achievement: Loremaster of Oricon
Dread Master Raptus is obtained from interacting with a Clickable Holocron.
Codex type: Persons of Note | Faction: Both | Class: All
Associated Achievement: Loremaster of Oricon
Dread Master Tyrans is obtained from interacting with a Clickable Holocron.
Codex type: Persons of Note | Faction: Both | Class: All
Associated Achievement: Loremaster of Oricon
Lord Hargrev is obtained from speaking with Lord Hargrev during "The Masters Revealed" mission.
Codex type: Persons of Note | Faction: Imperial | Class: All
Associated Achievement: None
Sergeant Trila is obtained from speaking with Sergeant Trila during "Day of Dread" mission.
Codex type: Persons of Note | Faction: Republic | Class: All
Associated Achievement: None