There were many ROO texts created in the time of Rassilon, the acronym R.O.O. referring to the triumvirate of Rassilon, Omega and the Other (MA: Goth Opera). They were known as Elder Books of the Dark Time.
The writings they contained were based upon rituals of the Gods of Ragnarok and the Eternals. They contained rites and incantations which could aid in summoning Chronovores, though they did not always prove easy to control. (NA: No Future)
List of known texts
- Ancient Covenant (PDA: The Quantum Archangel)
- The Black Book of Gallifrey (NA: Timewyrm: Revelation)
- The Black Scrolls of Rassilon (DW: The Five Doctors)
- The Bones of the Dead [source needed]
- The Book of the Old Time (DW: The Deadly Assassin)
- The Green Book of Gallifrey (NA: Timewyrm: Revelation)
- The Other Scrolls (PDA: The Infinity Doctors)
- Our Planet's Story (DW: Shada)
- The Record of Rassilon (DW: State of Decay)
- The Red Book of Gallifrey (NA: No Future)
- Runes of Rassilon (EDA: The Ancestor Cell)
- The Triumphs of Rassilon (NA: Lungbarrow)