Rashvine

Background
Be wary when harvesting  rashvine  because the plant comes by its name honestly. Indeed, calling its effect upon exposed skin a "rash" is an understatement. I've known apprentices who went without treating the red sores, assuming them irritating but harmless, and eventually required either magical healing or amputation.

Once the poison gets into the blood, it causes a painful calcification that turns the surface skin stone grey... and that's only the first symptom. In addition, it's primarily found in marshes and remote areas of deep vegetation, so there is often danger in finding rashvine patches, even aside from that in collecting it.

Fortunately (or unfortunately, if one happens to be a witless apprentice), rashvine has a number of useful applications: salves that harden the skin or otherwise provide protection, not to mention being one of the primary ingredients for Hawkers Flame. My advice? Use thick gloves and carry a sword.

—From Herbology in Tierra by Master Ilian Gravire

Uses

 * Upgrades:
 * Hawkers Flame
 * Cold Resistance Tonic
 * Electrical Resistance Tonic
 * Fire Resistance Tonic
 * Healing Mist
 * Pitch Grenade
 * Regeneration Potion
 * Rock Armor Tonic
 * Spirit Resistance Tonic
 * Ingredient in:
 * Antivan Fire (when fully upgraded)
 * Cold Resistance Tonic (when fully upgraded)
 * Electrical Resistance Tonic (when fully upgraded)
 * Fire Resistance Tonic (when fully upgraded)
 * Regeneration Potion (when fully upgraded)
 * Rock Armor Tonic (when fully upgraded)
 * Spirit Resistance Tonic (when fully upgraded)