W podziemiach natrafisz na trzy księgi, które będą przeczytane głosem narratora. Opowiadają one różne historie. Natrafisz na nie w na trzech różnych poziomach. Znajdują się w katedrze (dungeon, poziom 4), katakumbach (catacombs, poziom 8) oraz w jaskiniach (caves, poziom 12). W zależności od poziomu na jakim grasz, usłyszysz taką historię:

Normal - ciemno niebieskie księgi, opowiadające historię Diablo
Nightmare - czerwone księgi, opowiadające o mrocznym wędrowcu
Hell - szare księgi, opowiadające o Horadrimach
 

Dodatkowo został zamieszczony tekst, który wygłaszany jest w końcowym filmie, po ukończeniu gry. Tutaj możesz przesłuchać te teksty i przeczytać raz jeszcze.
 

The Realms Beyond (normal, poziom 4)
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. The 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 has named the battle for this world and all who exist here the Sin War.
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Tale of Three (normal, poziom 8)
Glory and aprobation to Diablo - Lord of Terror and leader of the three. My lord spoke to me of his two brothers, Mephisto and Ball, who were banished to this world long ago. My lord wishes to bide his time and harness his awesome power so that he may free his captice brothers from their tombs beneath the sand of the east. Once my lord releases his brothers, the Sin War will once again know the fury of the three.
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The Black King (normal, poziom 12)
Hail and sacrifice to Diablo - Lord of Terror and destroyer of souls. When I awoke my master's from his sleep, he attempted to possess a mortal's form. Diablo attempted to clain the body of king Leoric, but my master was too weak from his imprisonment. My lord required a simple and innocent anchor to this world, and so found the boy Albrecht to be perfect for the task. While the good king Leoric was left maddened by Diablo's unsuccessful possession, I kidnapped his son Albrech and brought gim before my master. I now await Diablo's call and pray that I will be reworded when he at last emeges as the lord of this world.
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The Dark Exile (nightmare, poziom 4)
So it came to be that three was a great revolution within the burning hells known as the Dark Exile. The lesser evils overthrew the three prime evils and banished their spirit forms to the mortal realm. The demons Belial (the Lord of Lies) and Azmodan (the Lord of Sin) fought to claim rulership of hell during the absence of the three brothers. All of hell polarized between the factions of Belial and Azmodan while the forces of the high heavens continually battered upon the very gates of hell.
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The Sin War (nightmare, poziom 8)
Many demons traveled to the mortal realm in search of the three brothers. These demons were followed to the mortal plane by angels who hunted them throughout the vast cities of the east. The angels allied themselves with a secretive order of mortal magi named the Horadrim, who quickly became adept at hunting demons. They also made many dark enemies in the underworlds.
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The Binding of the Three (nightmare, poziom 12)
So it came to be that the three prime evils were banished in spirit form to the mortal realm and after sewing chaos across the east for decades they were hunted down by the cursed order of the mortal Horadrim. The Horadrim used artifacts called soulstones to contain the essence of Mephisto, the Lord of Hatred and his brother Ball, the Lord of Destruction. The youngest brother - Diablo, the Lord of Terror - escaped the west. Eventually the Horadrim captured Diablo within a soulstone as well, and buried him under an ancient, forgotten cathedral. There, the Lord of terro sleeps and awaits the time his rebirth. Know ye that he will seek a body of a youth and power to posses - once that is innocent and easily controled. He will then arise to free his brothers and once more fan the flames of the Sin War...
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The Great Conflict (hell, poziom 4)
Take heed and bear witness to the truths that lie herein, for they are the last legacy of the Horadrim. There is a war that rages on even now, beyond the fields that we know - between the utopian kingdoms of the high heavens and the chaotic pits of the burning hells. This war is known as the geart conflict, and it has raged and burned longer that any of the stars in the sky. Neither side ever gains sawy for long as the forces of light and darkness constantly vie for control over all creation.
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The Wages of Sin Are War (hell, poziom 8)
Take heed and bear witness to the truths that lie herein, for they are the last legacy of the Horadrim. When the eternal conflict between the high heavens and the burning hells falls upon mortal soil, it is called the Sin War. Angeles and demons walk amongst humanity in disguise, fighting in secret, away from the prying eyes of mortals. Some daring, powerful mortals have eved allied themselves with either side, and helped to dictate the course of the Sin War.
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The Tale of The Horadrim (hell, poziom 12)
Take heed and bear witness to the truths thats lie herein, for they are the last legacy of the Horadrim. Nearly three hundred years ago, it came to be known that the three prime evils of the burning hells had mysteriously come to our world. The three brothers ravaged the lands of the east for decades, while humanity was left tremling in their wake. Our order - the Horadrim - was founded by a group of secretice magi to hunt down and capture the three evils once and for all. The original Horadrim captured two of the three within powerful artifacts known as soulstones and buried them deep beneath the desolate eastern sands. The third evil escaped capture and fled to the west with many of the Horadrim in pursuit. The third evil - known as Diablo, the Lord of Terror - was eventually captured, his essence set in a soulstone and buried within this labyrinth. Be warned that the soulsstone must be kept from discovery by those not of the faith. If Diablo were to be released, he would seek a body that is easily controled as the would be very weak - perhaps that of and old man or a child.
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The Soulstone burns with hellfire as an eerie red glow blurs your vision. Fresh blood flows into your eyes and you begin to hear the tormented whispers of the damned. You have done what you knew must be done. The essence of Diablo is contained, for now. You pray that you will become strong enough to contain the demon and keep him at bay. Although you have been fortified by your quest you can still feel him, clawing his way up from the dark recesses of your soul. Fighting to retain control, your thoughts turn toward the ancient mystic lands of the Far East. Perhaps there, beyond the desolate wastes of Arnok, you will find an answer or perhaps, salvation...
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