Wondrous Item

Uncommon

This old, leather-bound book is caked in dirt. Inside is an almost unreadable scrawl of words, written in Common, that go into remarkable depth about herbology. If you spend 48 hours over a period of 6 days or fewer studying the book's contents and practicing its guidelines, you gain proficiency with the herbalism kit. If you were already proficient with the herbalism kit, you instead gain the feature below. The manual then loses its magic, but regains it in 10 years if it's buried in soil for the duration. 
  Enhance Potion. You can spend 25 gp of materials -a collection of rare herbs and roots-to enhance a potion of healing. Doing so requires 1 hour of work using an herbalism kit, which can be done over the course of a short rest. At the end of the hour, the potion's color changes to a shimmering green. It remains this color for 7 days; for the duration, a creature that drinks the potion uses d6s, instead of d4s, when determining the number of hit points the potion restores. This feature can also be used to enhance a potion of greater healing (50 gp of materials), a potion of superior healing (75 gp), or a potion of supreme healing (100 gp).