Chaos Cult

Each time a Damned unit from your army with the Dark Pacts ability is selected to make a Normal or Advance move or declare a charge (excluding units that arrived from Reserves this turn) it can make a Desperate Pact. If it does, until the end of the phase, add 2" to the Move characteristic of models in that unit and add 2 to Charge rolls made for that unit.

Desperate Pacts Each time a unit makes a Desperate Pact, it must first take a Leadership test; if that test is failed, the unit suffers D3 mortal wounds before any effects of the Desperate Pact are resolved.