From Pathfinder Treasure Vault (Remastered), which isn't enabled.

Earthbinding

ITEM 5

Price 125 gp

Usage etched onto a weapon

Bulk —

A weapon with this rune hums when touched to the ground.

Activate (concentrate)

Frequency once per hour

Requirements You critically hit a flying creature with the etched weapon

Effect The rune casts a DC 20 Earthbind spell on the flying creature.

Pathfinder Treasure Vault (Remastered)ORC