Make 5 batches of powder to fire the gnomish cannons
The explosive gnomish cannon powder recipe can be found within the Thurgadin Supply Manifesto recipe book, which can be obtained by clicking on the Forgemasters Recipe Notes on the counter in front of Mikk Eishammer
The materials required for the recipe can be obtained by clicking on the jar of Gnomish Powder Supplies on the counter in front of Mikk Eishammer