From Pathfinder #179: Cradle of Quartz, which isn't enabled.

Metronomic Hammer

ITEM 5

UNCOMMON GNOME TRIP TWO-HAND-D10 VERSATILE-P

Price 160 gp

Usage held in 1 hand

Bulk 1

Category martial

Group hammer

Damage 1d6 bludgeoning

A polished brass metronome ticks rhythmically within the haft of this +1 striking gnome hooked hammer. Gnome adherents of Brigh often attempt to reproduce this item as part of a ritual symbolizing methodical problem-solving and thoughtful craftsmanship.

Activate envision

Trigger You attempt to Trip a creature with the metronomic hammer

Effect By timing the sweeping arcs of your Trip attempt to the built-in metronome of a metronomic hammer, you gain a +1 item bonus to your Athletics check to Trip the target. This item bonus increases by 1 with every subsequent Trip attempt you make with the metronomic hammer against the same target this turn, to a maximum of +3 on your third Trip. The bonus resets to +1 if you successfully Trip the target, if you critically fail to Trip the target, or if your turn ends.

Pathfinder #179: Cradle of QuartzOGL