Ensnare

Transmutation [Binding]
Circle: Tactician 1
Casting Time: 1 standard action
Range: [Long]
Effect: 40 ft radius of difficult terrain
Duration: [Encounter]
Saving Throw: None

You call up entropic forces, causing plants to grasp at creatures' feet, pavement to become inexplicably slippery, rocks to catch shins and ankles, and so forth. Squares in the area of the spell's effect become difficult terrain, and creatures in the area of the spell's effect cannot activate the Charge combat maneuver.