Petrification (Wizard Spell)

This spell petrifies nonliving wood, so it cannot be used in combat against live treelike monsters. If cast on a wooden weapon, it causes that weapon to have the properties of a weapon of stone, such as flint or obsidian. This effectively reduces the weapon's attack penalty from -3 to -2, and its damage penalty from -2 to -1; the weapon is now also completely fireproof. To a native of impoverished Athas, this can mean the difference between life and death in combat. 
The dweomer lasts until the spell's duration ends or until an enchanted missile strikes its target. Low-level mages often create their first magical weapons with this spell. One large or two small weapons may be affected by this spell (as per enchanted weapon). Weapons normally made of wood (clubs, staves, etc.) gain no additional benefits other than being fireproof. 
The material component is a chip of petrified wood.