The Glowing Omen is right in front of you.
| Declassify |
| "Col. Loomis's report denied arrival of additional elite forces during battle with supposed Locust tactician known as Karn." Elite Locust Defend Karn. |
| While this isn't really a killer, it can make certain parts of this fight much more complex. Instead of just Grubs, you'll get Theron, Boomers, and Ragers |
First, run around the outside of the area towards where Karn came out of the ground. Just past that point will be a Crimson Omen on the outer wall and just past that on the ground will be the [COG Tags]. Try to keep in cover and avoid Karn for now until he prepares to launch a grenade which will be characterized by a flaming catapult on his back. When it appears, start shooting the catapult. On harder difficulties, you won't be able to destroy the catapult in one go so you'll have to dodge this first volley and then bide your time until it appears again.
After it's destroyed, smaller Locust will join the battle including Cyclops and Maulers so be ready. Fight these off as you would any other enemies. You have plenty of cover so make good use of it. When you've eliminated this first group, Karn will return
On this second round with Karn, he will use one of the legs of his beast to pound on the ground. When you see his metal leg light up, start shooting at it. Similar to the catapult, on lower difficulties you should be able to destroy it in one go but on higher difficulties you might not be able to. When it is destroyed, he'll depart the arena once more and Theron Guards will appear while Karn shoots Nemacysts into the air.
Fight off this wave and Karn will return once more. This time, look for a point where the beast will open its mouth. When it does, shoot into it. Do enough damage to this weak point and you'll finish the battle. Keep in mind, however, that Ragers will start entering the battlefield and won't stop until you finish Karn.
