Diablo 1 Walkthrough -> Dungeon Levels
Church cellars (levels 1-4)
The church basements are the first four levels. The monsters on these levels are the weakest. I recommend clearing all levels, as it's crucial to maximize your experience and collect money/items there. Skeletons also drop the most money.
Visibility in the dungeons is very poor. Until your character has a high level and some cool gear, I recommend moving slowly, taking your time, and trying to kill monsters one at a time.
You'll also encounter some serious enemies on these levels—the Butcher and the Skeleton King. I recommend skipping them initially and returning to them only when you've cleared levels 5-6 of the catacombs without issue. Otherwise, they'll be very difficult or even impossible to defeat. Important! Save before each boss in case you die.
Temples and Libraries are most common in the church's dungeons. It's especially useful for mages to play through these levels several times, collecting as many books as possible.
Catacombs (levels 5-8)
The enemies here are fast and resilient, and they also reward more experience. It's pretty clear—the deeper you go, the more difficult it gets. Be careful, use the doors to kill monsters one by one, and look for magic that can defeat masses of enemies. Remember, if you're stuck, you can save your game, exit to the menu, and when you load, select "New Game" and clear levels 1-4 of the church dungeon again.
By the way, at these levels, monsters already know how to open doors, take this into account and try to pin the crowd of monsters in the door, and not wait for it to come to you and surround you.
But all your efforts will be well rewarded—there's more gold here, and the items you find aren't just old rags, but decent armor and weapons. You might even get lucky and find a good magic item.
Gear up, level up, and get closer and closer to Diablo.
Caves (9-12 levels)
A good spot for archers and mages—numerous streams of magma allow you to kill many monsters from a distance while they're still trying to figure out how to get to you. That is, of course, unless you encounter Magma Demons, who have a powerful ranged attack. And the Spitting Ones are also a pain, as their spit leaves behind poisonous puddles, which you can stand in to see your health drain away.
In general, the advice is the same as always: be careful, don't let yourself get surrounded, and completely clear all levels to level up as much as possible and collect money/items.
Hell (levels 13-16)
Succubi, though they look inviting, are a real nuisance to anyone who comes into contact with them. The mages will direct fire and electricity at you, and if you approach, they'll teleport away. It's very annoying.
And of course, Diablo... if you're lucky and get to him, he'll give you hell. It's worth noting that while Diablo hits very hard and can be quite knockback-heavy, the fight is fairly quick. It's either you beat him, or he beats you.
What you need to know: in the original game, before the fight with Diablo, you need to collect all the items in the city, because after killing him, the game will immediately end.
Source: www.diablo1.ru
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