This heavy and tattered tome is labeled with a large and ancient rune that translates simply to 'Death'. Among its more interesting passages is the following:
"The Ettercap Silk Gland is a substance known to augment and accentuate the capabilities of other reagents, and is therefore quite popular amongst the scholars of wizardry. The Skeleton Knuckle is a popular reagent to combine with the gland because the solidifying of the boundaries between life and death causes brief flickers in existence, allowing the wielder to temporarily become invisible. However, when further empowered with the spell Improved Invisibility, the end result is much more stable, and allows for the wielder to maintain more control over the boundaries of magic, life and death."