When you will find a scroll for the first time you won't know what it does. To check it you should read it or identify it with a scroll of identify. When you will find that scroll the next time you will know what it does. The scrolls are usually good - they can enchant you weapon, armor, hold the monsters near you, but there are also scrolls that makes you sleep, wakes up all the monsters on the level or create a new monster near you.
A scroll |
The read button |