Diablo 1 Walkthrough -> Crypt
Here you are. With each new dungeon, the search for similarities between them becomes less and less successful. The Crypt resembles a Gothic-style room. The well-kept tile floors won't shine for long with their polished surface. Soon, soon, the blood of the demons you slew will spill upon them. This place is the habitat of the graveyard's abominations.
Every draft that envelops you in its embrace feels like the breath of death, sapping all the strength from your exhausted body. Most of the creatures living here lack blood to warm them. And most of these creatures merely harmonize with the deadly atmosphere that reigns here.
There are coffins scattered throughout the area, and if you dig through them, you might find a few gold coins. Instead of barrels and cocoons, there are jars. They might also contain some good items.
You can deduce your mission in the Crypt from the descriptions found in the tomes found here. They tell of a mad scientist-mage who created a wild creature that escaped his control and killed him. This creature is named Na-Krul. You must kill it, and the scroll fragments you find here will help you do so. By collecting the Reconstructed Note, you will learn how to weaken Na-Krul's power.
But to reach it, you'll have a difficult journey ahead. It'll be tough against the Crypt Demons, who are composed entirely of stone laced with iron, making them highly resistant to physical attacks. They're not particularly fast, but if they do manage to hit you, you'll be in trouble.
Most of the monsters here fight melee, with the most dangerous being Crypt Demons, Satyr Lords, and Reapers. Among the long-range attackers, the most dangerous are Bats and especially Liches, who literally suck the soul out of you with their deadly blasts.
On the first floor of the Crypt, in a small room, you can also find the Cornerstone of the World. If you leave an item on it, you'll find the same item there in another game, with a different character, or with the same character. This Cornerstone is the same for all games. So, if you take an item from it, it won't be there in other games.
Upon death, Na-Krul will leave behind four items, including the Book of Apocalypse. This is an extremely rare book, so it's worth the journey to Na-Krul just to obtain it.
Source: hermitum.narod.ru
See also:
How to get to the Hive? (Diablo 1)