Nifty item, with a clear purpose and history. I can imagine, though, that wooden items would begin to be viewed with great suspicion in your world, if these weren't at least somewhat rare. Sure, a spy might be able to get away with it once, but surely all operations manuals for the CDN and PLAA would include sections on recognizing and counteracting blast canes?
Love the idea! Enjoyed the style and background of the group. Explained well and was a lot of fun to read and I had no issues accepting it as is. Usually I have unanswered questions as I go through but I think it is delightfully complete. Having a heart attack while destroying a city is comedic and enough for me. I see the Mage swearing inwardly, "That the city is so damn stupid that it wouldn't be worth destroying and giving myself a frick'n heart attack." Then he controls his rage and storms off.