Adamantine Weapon
School: Transmutation; Level: Artificer 3
Casting Time: 1 round
Components: S,M (a pinch of adamantine dust)
Range: Touch
Target: Weapon touched
Duration: 1 minute / level
Saving Throw: None; Spell Resistance: No
Source: MoE, pg. 93
By touching a melee weapon, or a bundle of up to 50 pieces of ammunition, that is already made (at least mostly) of metal, you transmute it into adamantine, counting as such for the purpose of damage reduction. The weapon looses any other material-based qualities for the duration of the effect.