As Wizards are often left to pursue their own paths to power, many end up perusing texts unfit for mortal minds.
The bearer of the Tome of Midnight may apply a +1 modifier to any of their Casting rolls when attempting to cast spells from the Lore of Daemonology, Dark Magic or Necromancy.
In addition, they know one more spell (chosen in the usual way) than is normal for their Level of Wizardry. However, the bearer can only cast a number of spells equal to their Level of Wizardry per turn and is subject to the Loner special rule.