The Realms Beyond is a Tome, hidden deep within the labyrinth beneath the cathedral in Tristram. Archbishop Lazarus is presumed to be the writer. Players may encounter this tome in Diablo I.

The Realms BeyondEdit

An excerpt from the Realms Beyond:

"All praises to Diablo - Lord of Terror and Survivor of the Dark Exile. When he awakened from his long slumber, my Lord and Master spoke to me of secrets that few mortals know. He told me the Kingdoms of the High Heavens and the Pits of the Burning Hells engage in an eternal war. He revealed the powers that have brought this discord to the realms of Man. My Lord and Master has named the battle for this world and all who exist here the Sin War."

Tomes
Diablo I Tomes
Story Tomes — Book of Blood • Mythical Book • Book of the Blind • Steel Tome • Dark Exile • Sin War • Binding of the Three • Great Conflict • Wages of Sin are War • Tale of the Horadrim • The Realms Beyond • Tale of the Three • The Black King Items — Ancient Tome • Fungal Tome
Diablo II Tomes
Story Tomes — Moldy Tome • Horazon's Journal Items — Book of Skill • Lam Esen's Tome • Tome of Town Portal • Tome of Identify