Word Lord

The Word Lords were natives to a reality 45 billion dimensions to the left of ours. Being that universe's equivalent of the Time Lords, the Word Lords were masters of their domain.

Biology
The Word Lords were identical to the Time Lords in both their superficial resemblance to humans and their completely alien physiology. Complete with two hearts, a respiratory bypass system and an internal body tempurature of 15 degrees Celsius they were completely identical although the differences between the universes probably influenced some unspecified changes. (BFA: The Word Lord)

History
The Word Lords were founded by All, their equivalent of Rassilon who created the Hand of All, a synthetic pocket universe that fueled their civilization. Their most evil and corrupt member, Nobody No-One was either forcefully banished or fled of his own accord in essence a fugitive as by the time he matched wits with the Doctor he resided in our universe, not theirs. Their equivalent of the TARDIS was the CORDIS, which ran on common words and phrases used throughout the multiverse and disguised themselves as such. Nobody was trapped inside The Hand which was moved inside the mind of the Doctor who was nearing his seventh regeneration. Forging an alliance with his earlier self, the Doctor trapped Nobody back inside the Hand and moved it to the mind of Evelyn Smythe as she drew her terminal breath. The Hand died with Evelyn as did Nobody and the future of the Word Lords whose society would soon crumble without the Hand's power to nourish it. (BFA: A Death in the Family)