There are some wizards whose knowledge of their chosen discipline is all-encompassing.
Source: Warhammer Fantasy: 8th Edition
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A Wizard with the Loremaster special rule knows all the spells from his chosen lore – he does not need to roll randomly. The lore in question is normally given in brackets as part of the Loremaster special rule. For example, a model with Loremaster (Fire) would know all the spells from the Lore of Fire.