Skullcrusher

SkullcrusherHeavy Mace
Hands	One-handed
Damage	1d8 Bludgeoning +2 enhancement
Critical	20 (x2)
Range	2 ft. Melee
Proficiency	Simple
Qualities	Enhancement +2 Heavy Blow
Flavor text
A grim sense of totality surrounds this heavy mace.
Effects
Whenever this +2 heavy mace confirms a critical hit, the target needs to succeed at a Fortitude saving throw (DC 17) or become stunned for 1d4 rounds. If the saving throw is successful, the target is staggered for 1 round instead.
6 lbs.
Sell: 3000 Buy: 12000
[Show Blueprints]
Skullcrusher (60d447726ca562c4ba9b4576beaee7f5)
Enhancement2 (eb2faccc4c9487d43b3575d7e77ff3f5) StunOnCrit17 (c4d17560bd7d0344d82f08b7b40457f2)

Skullcrusher is a magic heavy mace in Pathfinder: Kingmaker.

Source

Found in the ruins atop Talon Peak.