Fusion coils have appeared in numerous Halo entries. Capable of inflicting mass damage on Spartans and vehicles, they have a large blast radius and can be thrown extremely far.
It can be a little hard handling that bad boy but, here are a few tips.
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Halo Infinite: How To Kill Enemy Spartans With The Fusion Coil
The fusion coil can be picked up here and there around nearly every multiplayer map. When approaching the device, pick it up but don't launch it yet. Be aware that these act as highly explosive and volatile grenades, where you can if it lands near you. Be sure to aim at a reputable distance from you. To launch, all you need to do is press Rt (left mouse button for PC players).
They cause a gigantic explosion capable of decimating vehicles and opponents. Additionally, you can also shoot the coil in mid-air through which, it will explode. If timed right, you could hit Spartans who are airborne, as well as flying vehicles.
It's best to ask a friend to assist you. While they attempt to obliterate the shields of your foes, you can whip the fusion coil at them, increasing your chances of completing the objective.