Tinker

You have proficiency with tinker's implements. You can use these and spend 1 hour and 100 cr worth of materials to construct a Tiny Device (AC 5, 1 hp). You can take the Use an Object action to have your device cause one of the following effects: create a small explosion, create a repeating loud noise for 1 minute, create smoke for 1 minute, emit an onerous smell for 1 minute. You can maintain a number of these devices up to your proficiency bonus at once, and a device stops functioning after 24 hours away from you. You can dismantle the device to reclaim the materials used to create it.