Tripwires

Astra Militarum Infantry model only. Each time an enemy Infantry or Mounted unit ends a Normal, Advance, Charge, or Fall Back move within 9" of the bearer's unit, roll a D6; on a 4+, until the start of your next turn, that enemy unit is stunned. While a unit is stunned, each time a model in that unit makes an attack, subtract 1 from the Hit roll.