Diablo/Halls of the Blind

At level 7, in the catacombs, you might find a book called "Book of the Blind". It is located right next to a large hall in the shape of an 8, with two small rooms inside. By reading the gloomy nursery rhyme in the book, the hall nearby will become accessible. Be very careful though, when you enter. The hall is full of invisible enemies, called Illusion Weavers, with a powerful attack, which appear only when they are close. They are located both in the corridor and in the two internal rooms. You can eliminate them in any way you like, but you must proceed very carefully, trying to fight with them one at a time. If the Illusion Weavers manage to surround you, you could in fact find yourself in a very bad situation. Once you've taken them all down, you'll hear a rattling sound and the Optic Amulet will appear in one of the two inner rooms, which you can collect.

REWARD: Optic Amulet
 * +20% Light Radius
 * Resist Lightning + 20%
 * -1 Damage from Enemies
 * +5 to Magic