The story: you are a random medieval fake druid (there is no real magic, only fakes like you) but by accident you stumble upon gunpowder. What is the best way for you to exploit your new invention without killing anyone (or selling it to someone who might kill someone) for you are a pacifist and do not believe in violence of any kind.
closed as off-topic by sphennings, Thucydides, L.Dutch - Reinstate Monica♦, Mołot, Azuaron Aug 3 '17 at 13:01
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "You are asking questions about a story set in a world instead of about building a world. For more information, see Why is my question "Too Story Based" and how do I get it opened?." – sphennings, Thucydides, L.Dutch - Reinstate Monica, Azuaron
As Alexander says, you can use it as firework, but also for civil engineering : if gunpowder can blow up castles, it can also blow up rocks.
Before the use of gunpowder, fire-setting was used to destroy rocks, but was replaced by gunpowder during the Renaissance.
Some projects such as canal du midi were done thanks to gunpowder. Canal du midi was a great project for this time: it connects Toulouse to Mediterranean Sea, making, via the Garonne, a path between the Mediterranean Sea and Atlantic Ocean
Keep in mind that safety fuse is a late invention, so it was quite dangerous. Plus, you can also use it for mining, but they are two more risks: smoke, as mine is not in open-air, and gas, that can make a chain reaction.
Use it like Chinese did for centuries. Create fireworks!