Metal Magic

Metal Magic is a school of Transmutation that deals with manipulating a variety of metals. It allows to change their shapes - unfortunately, as in case of majority of transmutation magics, only temporarily - shortterm materialization of weaponry and projectiles (together with launching them at enemies). Some masters of this craft are even capable of transmuting metals into another one at will, though it costs enormous ammount of power and impeccable control.
The biggest problem of Metal Magic is that all matter tends todo all it can to return to its normal state, with magic being able to change only its outward characteristics. The permanent transmutation is local equivalent to top-tier subschools of Elemental Magic (for example Bluefire Magic from Fire Magic), which means it is extremely hard to master.
99% of Metal Magic users can at best create or change things for up to few second, before the Light will find out something is wrong, and returns into its natural state. On the other hand, Metal Magic also allows a short-term transmutation into some sort of 'special' metal, giving not only increased penetration (while increasing energy costs and the difficulty level of spell) but also some special effects.