Tantrum!
An amber stone is embedded inside a small momento which clicks when a recessed button is pressed whilst theitem is touching a wall or floor. When activated the room and all items made from terram, animal, and herbam materials inside are thrown a few paces away from the activator. Their movement will not inflict damage, but may damage the room and its contents. The amber stone adds a +3 lab bonus.
Rego Terram / Animal, Aquam, Herbam 15 (base 3, +1 Touch, +2 Room, requisites for An, Aq, He)(+1 level for 2x uses per day, +4 levels to add +8 penetration)