Katakuda

Katakuda, also known as dragonskin, was a drug that originated somewhere in the lands of Kara-Tur.

Description
In its usable form, the drug appeared as a brown paste that was applied directly on the skin.

A single dose cost 100 gp in Faerûn, after it was imported from the east.

Effects
When applied, katakuda hardened the user's skin for a duration of a half hour. After that time, the user's muscles went into spasm causing incredible pain.

Usage
Developed by an order of monks, the substance greatly increased the amount of punishment they could receive in battle and was only used when the most dire of battles were expected.