Target a friendly warjack.
The warjack can immediately make one melee attack against an enemy model within 1". If the attack hits, the model hit suffers a damage roll with a POW equal to the attacking warjack's STR. This attack causes kinetic damage.
Additionally if the model hit was a warjack, it suffers the System Failure continuous effect.
Frequently Asked Questions : Applying System Failure
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Q: What happens when a model is affected by the melee System Failure Continuous Effect and gains another System Failure continuous effect?
A: A model can only have one of each type of continuous effect on it at a time. A model cannot gain another instance of this continuous effect regardless of it applying to ranged or melee attacks.