Harbinger

HarbingerEarth Breaker
Hands	Two-handed
Damage	2d6 Bludgeoning +4 enhancement
Critical	20 (x3)
Range	2 ft. Melee
Proficiency	Martial
Qualities	Enhancement +4 Giant Bane Harbinger
Effects
This +4 giant bane earth breaker grants the wielder a +3 insight bonus to AC against the undead's attacks.
14 lbs.
Sell: 14250 Buy: 57000
[Show Blueprints]
HarbingerItem (476180ae2aa374946a965880c5dc5385)
Enhancement4 (783d7d496da6ac44f9511011fc5f1979) BaneHumanoidGiant (dcecb5f2ffacfd44ead0ed4f8846445d) HarbingerEnchantment (897fe14cb7815a74490b8e9b72dc4d3d)

Harbinger is a magic earth breaker in Pathfinder: Kingmaker.

Source

Can be found in the Ancient Cemetery encounter location when heading to Vordakai's Tomb.