Universal Rule.
Units consisting entirely of models with Unstable Engines:
• Gain +D6′′ to their Charge Range rolls in the Charge Phase. Also add this D6 to the Failed Charge distance.
• Immediately after choosing to perform a March Move, gain +D6′′ March Rate.
Immediately before a model is removed as a casualty from the unit, the model inflicts D6 hits with Strength 4, Armour Penetration 0 and Flaming Attacks against all units (including the model’s unit) within 6′′ of the model.
Roll once for the number of hits inflicted against each unit. These hits are considered Special Attacks.