The Brekenkrieg Grimoire. Light reading?
Willow Rosenberg to Tara Maclay[src]
Buffy613 292

The Brekenkrieg Grimoire was a book on magic, specifically in regards to resurrection spells and the possible side-effects of performing a resurrection.

Tara Maclay consulted it as part of her research into why Spike was able to hurt Buffy Summers after her resurrection, despite of Spike's Behavior-Modification Circuitry.