SRD:Mace of Smiting

Mace of Smiting: This +3 adamantine heavy mace has a +5 enhancement bonus against constructs, and any critical hit dealt to a construct completely destroys it (no saving throw). A critical hit dealt to an outsider deals x4 damage rather than x2.

Moderate transmutation; CL 11th; Craft Magical Arms and Armor, disintegrate; Price 75,312 gp; Cost 39,312 gp + 2,880 XP.