From Destinypedia, the Destiny wiki
Good fighters have contingency plans. Great fighters don't need them.
Sharp reflexes keep you alive on the frontier - but no matter how fast you are, a fusion rifle can only charge so quickly. Enter the Plan C. When you draw the weapon, fast-rise capacitors and a smart induction system prime for firing. The 'ready fire' state only lasts a few moments - but in a gunfight, those moments matter.
As the name suggests, Plan C is an excellent backup weapon. Switching to it is incredibly fast, and starts with a very short charge time, making it great for emergencies.
The namesake trait lasts for one second with a hidden 10 second cooldown between uses.
List of appearances