Poisoner’s Almanac

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: Level Up Advanced 5e · OGL-1.0a · 5.1