How to kill the Two-Headed Abomination in The Callisto Protocol

The Callisto Protocol punctuates its terror with high-intensity boss fights. Unfortunately, many of these bosses are reused, like the Two-Headed Abomination. Knowing what to do on subsequent encounters doesn't necessarily make it any easier, as boss fights in The Callisto Protocol are brutal. But knowing is half the battle. So, here's how to kill what is arguably the most aggravating boss in The Callisto Protocol.

Each Two-Head Fight in The Callisto Protocol

First Encounter

The first encounter with Two-Head is by far the easiest but it still doesn't mean that you will have an easy time with it. Odds are you're already low and ammo and health from the previous swarm. There are a couple of pointers when fighting Two-Head:

1. The GRP doesn't work on it.
2. He hits like a runaway train. Even at full health, two hits from it will kill you.
3. Don't try to melee it, as the hitbox is wonky and he will almost always counter with its own punishing attack.

Surviving this fight is all about managing the encounter before it. You'll have access to a 3D printer beforehand. Make as much ammo as you can for whatever weapons you have. There will be plenty of GRP batteries on the platform. Grab the enemies as they climb onto the platform and shoot them off the side with the GRP. Avoid traditionally fighting at all costs, as you need these resources for Two-Head.

When Two-Head does show up, keep your distance and lay into it with your guns. You won't really see it taking damage until it switches to its next phase. This is marked by Two-Head dropping to its knees, allowing you to beat on it with your baton. After enough hits, Two-Head will stand back up and rip off half of its body. The second phase of the fight will play out exactly like the first. Keep your distance and pump ammo into the abomination.

Related: Combat basics in The Callisto Protocol

Second Encounter

Your second go-round with Two-Head will be almost identical to the first. This time, it will bring company. The fight essentially plays out the same, but you'll want to keep some distance between Two-Head and the other enemies. Kill them as quickly as possible, as Two-Head is surprisingly fast and will be on top of you before you know it. There will be boxes of supplies spread around the arena. Keep moving when you try to pick them up. If you miss it, keep moving. Loop around as needed, but do not stop moving.

Third Encounter

The third encounter is nearly identical to the second except for it being in much tighter quarters. Keep looping Two-Head, keep plenty of distance between it and yourself, and dump everything you have into it.

Fourth Encounter

The fourth, and thankfully final encounter with Two-Head, decides to pull out all the stops. It comes with friends again, but the friends are the crawling boomers. Use this to your advantage, grab them with the GRP, and fling them back into Two-Head's faces to put it down for good.

For more The Callisto Protocol goodies, check out What should you do with Energy Converters in The Callisto Protocol here on Pro Game Guides.