Sting. Concealable. Glows blue when Orc, goblin, or desert meth heads (basically, a ruined form of elf) are about. Made out of Elvin alloys, so probably undetectable to modern equipment.
how about my 'Trained Skunk' defense-in-depth security system:
outer perimeter consists of signs: 'Warning, Bio-engineered Attack Skunks!'
next defensive layer has trip-wire activated squirt cannons (from toy stores) hidden in fluffy skunk cuddle toys, loaded with coverup skunk scent (purchased from hunting stores), and with supplementary aerosol horns attached (from West Marine stores)
next defensive layer is a family of very friendly de-scented indoor/outdoor skunks, carefully trained to expect food from all visitors
inner defensive layer (bedroom) consists of skunk costume pajamas and mace canisters
(go for chemical weapons, as gunpowder weapons are pretty much of a big drag, due to leaving messy bodies laying around and all the explaining, press, social controversy, and legalities involved)
Let us know!