A thundering weapon creates a cacophonous roar like thunder upon striking a successful critical hit. The sonic energy does not harm the wielder. In addition, the weapon explodes with sonic energy on successful critical hit, dealing extra sonic damage as set out in the table below. (This effect activates even if the target is not normally subject to extra damage from critical hits.) This burst does not harm you or any creature other than the target. This is a continuous effect and requires no activation. Subjects dealt a critical hit by a thundering weapon must make a DC 14 Fortitude save or be defeaned permanently.

Critical Multiplier	Extra Sonic Damage
×2	1d8
×3	2d8
×4	3d8

Projectile weapons bestow this property upon their ammunition.

Prerequisites: Craft Magic Arms and Armor, blindness/deafness.
Cost to Create: 1,000 gp (plus 300 gp for base item), 80 XP, 2 days.