Gresil, Custodian of Records, is the demon lord

Demon lord (Dungeons & Dragons)

In the Dungeons & Dragons fantasy role-playing game, demon lords are demons who have gained great power and established a position of preeminence among demonkind. Each demon lord has a unique appearance and set of abilities. Most control at least one layer of the Abyss...

 of Abyssal

Abyss (Dungeons & Dragons)

In the Dungeons & Dragons fantasy role-playing game, the Abyss or more fully, the Infinite Layers of the Abyss, is a chaotic evil-aligned plane of existence. It is one of a number of alignment-based Outer Planes that form part of the standard Dungeons & Dragons cosmology, used in the Planescape...

 lore, in the Dungeons & Dragons

Dungeons & Dragons

Dungeons & Dragons is a fantasy role-playing game originally designed by Gary Gygax and Dave Arneson, and first published in 1974 by Tactical Studies Rules, Inc. . The game has been published by Wizards of the Coast since 1997...

roleplaying game.

Publication history

Gresil was one of many demon lords that was mentioned only by name in a list in the original Monster Manual II (1983).

Gresil was briefly mentioned in the article "Artifacts of Oerth: Instruments of the Gods", a 2002 article which ran in both Living Greyhawk Journal

Living Greyhawk Journal

The Living Greyhawk Journal was a periodical published by the Role-Playing Games Association as a stand-alone magazine from 2000 to 2004. The publication was intended to supplement the RPGA's Living Greyhawk campaign, though many consider the content within to be canon for the Greyhawk setting in...

#10, and Dragon

Dragon (magazine)

Dragon is one of the two official magazines for source material for the Dungeons & Dragons role-playing game and associated products, the other being Dungeon. TSR, Inc. originally launched the monthly printed magazine in 1976 to succeed the company's earlier publication, The Strategic Review. The...

#294. Gresil received further details in third edition in Fiendish Codex I: Hordes of the Abyss

Fiendish Codex I: Hordes of the Abyss

Fiendish Codex I: Hordes of the Abyss is an optional supplemental source book for the 3.5 edition of the Dungeons & Dragons roleplaying game.-Chapter 1: Demonic Lore:...

(2006).

Realm

Gresil has millions of texts in his great library, and it is said that the artifact Kuroth's Quill

Kuroth's Quill

Kuroth's Quill is a powerful artifact, in the Dungeons & Dragons fantasy role-playing game.-Advanced Dungeons & Dragons 1st edition :Kuroth's Quill was first described in the original 1979 Dungeon Master's Guide....

can be destroyed by using it to transcribe all of these texts.