Gnomes are Evil - Fable 3
Available after completing Gnomes are Great
Speak to Brian in his gnome shrine and learn that his gnomes just ran away. You have to find all 50 of them since they'll be part of the game's collectibles but for now, you need to find one. Follow the trail as it leads you to Brian's house. Bring out your gun and zoom in. When you're hunting for the other gnomes, just listen to their annoying voices and verbal abuses. Shoot him down then open the chest. Return to Brian. You won't be able to get 40 GS that was promised until you find all the gnomes. You won't be able to gather all gnomes at this point of the game; just refer to this guide's collectible section to find the all.
After finding them all (And getting the Gnome Invasion achievement) travel back to Brightwall and talk to Brian. Follow him to his shrine then shoot the gargoyle when you're prompted to.
Guild Seals: 40
Reward: Various items and Gnomewrecker pistol.