Halo Infinite features many different weapons to use. These include close-range weapons, sniper rifles, and even using vehicles as weapons by splattering them. One thing that may not have to come to mind when looking for weapons is the fusion coil.
These explosive devices are scattered throughout Halo Infinite's maps. Players can pick up fusion coils by interacting with them. Once you are carrying a fusion coil, you can then throw it at an enemy by pressing the fire button.
You can throw fusion coils surprisingly far, but the closer you are, the more likely you will hit. While fusion coils have a large blast radius, you will need to hit an enemy directly or very close to kill them. Once it explodes, it will leave behind a small radius that will deal residual damage to any enemy in that area.
Fusion coils can also be detonated by shooting at them, even when thrown. If you time your shot correctly, you can kill an airborne enemy or vehicle. Having a friend shoot it after you've thrown it will make this easier and be a cool kill.
For more information on Halo, check out Where are tanks in Halo Infinite Multiplayer? How to get Scorpions and Wraiths and How to use Theater mode to watch replays in Halo Infinite Multiplayer on Pro Game Guides.