Air Hammer (Magic Hammer)

These non-descript, stone hammers are marked with a certain dwarven rune-two circles, one inside the other. They are found throughout dwarven delves, lying on ledges and wedged in rock fissures, as though discarded. They are actually emergency aids. If an air hammer is broken, or the rune upon it struck sharply (that is, if it used to strike a blow), it activates. A loud, repetitive knocking noise is heard, and the air hammer begins to vibrate rapidly, swinging back and forth, as it diminishes in size. The stone hammer is actually the stopper or portal valve to an extradimensional space, filled with pressurized oxygen from the Elemental Plane of Air. When it is activated, the extradimensional space rapidly collapses, pumping its contents into the surrounding atmosphere.
Dwarves use this to escape underground smoke, poisonous gases (including cloudkill effects), or floods (air hammers create a bubble of air). The oxygen forcibly drives out existing atmosphere, providing clean air in a globe with a 30' radius around the activation point. There is enough air to last eight human-sized creatures (or twelve dwarves) for one turn, given normal exertion (the air lasts half that time if combat occurs).
This clean air cannot be moved as an intact globe, once released, and it is highly dangerous if brought into contact with open flames-creating an instant 30', 5d6 ball of fire. Magical fireballs that contact an air hammer's oxygen globe instantly double in radius, and gain 6d6 additional damage power. 
Category:Encyclopedia Magica Magic Items
Category:Magic Items
Category:Magic Hammers
Category:Magic Weapons