The Callisto Protocol – How to Beat the Last Boss

A quick crash-course on what you might need to do to salvage this.

Final Boss Tips

All credit goes to DR-10!

• If you’re just starting the fight, you barely have enough time to get a full heal injector off if you start healing right as it loads in, he’ll open with a ranged attack (Or at least he has from my experience) and you’ll eat that hit, but you’ll gain more health than you’ll lose, if you hold S while healing you’ll also auto-block the projectile he throws at you.
• The GRP is going to be your savior during this fight. If you’ve got enough ammo to first phase him, (Breaking the head shield and hurting him till he roars and regenerates it) he’s going to summon a crowd of those exploders to try and kill you, these guys drop ammo when killed. You’ll want to bunch up as many of them as you can, GRP grab one, then throw them into the rest, you’ll kill them all and they should drop a lot of ammo to keep the fight going. If you can, group them all up under the boss then grab and throw one at the group, they’ll all detonate and do a massive amount of damage to the boss, then after you kite him away you can run in and snap up all the ammo they dropped. Do not try to baton the exploders under any circumstances, it’ll only go badly.
  • To add onto above, I’d also recommend being aware of where the exploders are in the arena or how many of them are in play, because you can dodge the boss attack and wind up atop one, and then it’ll immediately detonate and kill or ragdoll you, giving the boss time to start a follow-up attack and kill you. If you can’t confidently corral or manage them, then prioritize killing them first and securing the ammo when they show up, then focus on the boss.
• There’s also crates sitting around the edges of the arena which should also contain ammo and general supplies, they’re scattered around the outer ‘ring’ once you get past the broken walls. Health pickups also appear on the shelves, I believe, so those may also be useful.
• You sprint faster than the boss walks, use this to your advantage to get some breathing room, but keep in mind he’ll sprint towards you to get a swing off if you get too far away or if he goes too long without attacking you.
• If you know he’s about to attack or sprinting up to attack, ensure you’re facing him and get ready to dodge. If you’re not looking at him when the attack goes off, it seems to not matter whether or not you have a dodge key pressed, you’ll eat the hit and die.
• Vaulting over the walls on the edge of the arena can get you some space because he can’t vault them, he has to walk around them. Use this to your advantage.