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Spellbooks were used in Diablo I to learn Spells. They could be found in various places in the Labyrinth such as Bookcases, Skeleton Tomes, and Chests. In addition, they could be obtained by killing enemies or purchased from Adria. They teach you spells of whatever the book's title was. For example: A Book of Firebolt teaches you the Firebolt spell. If you happen to find the book again, you can learn the higher leveled version of the spell.

Not all who wish to improve their spells through reading books may have a chance, however. There is a enforced requirement on a hero's Magic attribute. If the hero does not possess that requirement, they are unable to use the spellbook. For each level earned for a spell, the Magic requirement to gain another level increases by 20% until the requirement reaches at least 192 Magic. After that, the next level (and all subsequent levels, if applicable) require a Magic attribute of 255. The only way to get by without such an imposing restriction is to make use of a certain shrine, namely the Enchanted Shrine, and even then is that type of shrine making the hero suffer from a trade-off which may decrease the level of a desired spell and increase the levels of the others, it would be too harsh for the trivial gains.

Here are the all the available spells you can learn:

Spell Initial Cost Cost decrease /level Minimum cost
Apocalypse 150 6 90
Blood Star 25 2 14
Bone Spirit 24 1 12
Chain Lightning 30 1 18
Charged Bolt 6 0 6
Elemental 35 2 20
Fire Wall 28 2 16
Fireball 16 1 10
Firebolt 6 0.5 3
Flame wave 35 3 20
Flash 30 2 16
Golem 100 6 60
Guardian 50 2 30
Holy Bolt 7 1 3
Inferno 11 1 6
Mana Shield 33 33
Town Portal 25 .5 15

In Diablo II and Diablo III, the spell system was replaced by the Skill Trees, eliminating the need for books. Instead of using books, you would have to spend skill points/choose the desired skills and runes from the list on Skill Trees in order to make your spells/skills more effective.

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