Explosive Jar

Description
Originally created in Khitai for use in fireworks, enterprising warriors and merchants soon saw the value of using this explosive powder in warfare. The jars are prepared, filled with the powder and carefully sealed against the air. The very touch of air is enough to ignite the powder yet each jar comes with a fuse that can be lit for a delayed detonation.

Repair
Repairing  requires up to:
 * 4