The final Halo Infinite Boss Battle, Harbinger, is one of the toughest to defeat in the entire campaign. Not only do you have to defeat her, but you have to destroy the countless hordes of Banished she sends toward you too.
Luckily, there are some who have been able to defeat Harbinger in Halo Infinite. Here's how to get it done.
Halo Infinite: How to Defeat Harbinger
As mentioned before, one of the hard parts of battling Harbinger is the endless Banished that she sends your direction to protect her. You'll have to clear out enemy after enemy until she finally pauses what she’s doing inside her shield, giving you the chance to pounce.
When her shield is down, Harbinger will be vulnerable to attack, so let her have all your firepower. You can find plenty of strong weapons around the arena you are all battling in, so use them to your advantage to take her health down, before she brings her shield back up.
This will continue for a few rounds, with each wave of enemies Harbinger sends at you getting more and more difficult. But as long as you don't play too aggressively and don't stop moving, this battle can be won. Be careful with the charging Brutes, flying Sentinels, cloaked assassins, firing Grunts, and more that Harbinger throws at you, and be sure to use your Drop Wall and Grappleshot. Then, when you defeat her, don't forget to sit back and enjoy the final cutscene and post-credit scene.