On Pit Fiends

The history of the first age discusses some commonly known creation myths, including the creation of most 'evil monsters,' including devils and demons. Infernals, a catch all term for most monsters in the world, were created by Apophis to torture the civilized races and followers of father Ammon. Notable among all Infernals were the great Pit Fiends, monsters of horrible power. Their names are listed, though no details are given about them. They are Nyarlathotep, Gobogeg, and Krang. In ages past they fought wars with humans, but now peace is common throughout the world. The only active portion of this ancient conflict takes place at the border of the top of the World, as Gobogeg continues his attempted assault into the Elven Circle, and down into the rest of the world.

Another small section simply talks about various monsters, though none of them are well labeled or documented past being called 'infernals,' a small handfull having crude illustrations.