Poisoner’s Almanac
Wondrous Item,
Rare
(cost 2500 gp)
Crafting Components
Roots taken from the Dreaming
Poisonous botanicals were pressed into the pages of this tome long ago, and when found only 2d6 pages remain. You may tear out a page and dissolve it in any liquid over the course of 1 minute, transforming it into oil of taggit. When dissolved in a potion, the potion becomes inert.
Source