-Max chain over 100 - 600
-Completed with 140 left - 800
-No mistakes - 600
Alright! Pempti! Now this is one fun operation. After the smorgasbord of criminally easy operations throughout this chapter, we finally get rewarded for our efforts by this beauty of a GUILT. Pempti is the hardest strain you've fought up till now by far. You're going to be using Victor's new laser here almost exclusively, and it happens to never run out, so it's not a bad idea to keep the button held down when using it. A big problem with Pempti is that if you're not on the ball, it's very easy for it to overwhelm you. It has a very effective pressure strategy in that when something gets past you, rather than giving you a chance to repair your mistake, it doesn't let up and continues fighting aggressively. This results in the odds stacking higher and higher against you because when you're dealing with your mistakes, this is wasted time that you should have been using to prevent Pempti's attacks in the first place. Basically, once you let something past you, the chances of the next attack causing damage are higher, then once that gets past you, the chances of the next one succeeding are even higher, and so on. Until you're completely overwhelmed and there's no more hope. But anyway...
This is the last time you'll be operating on secretary Anderson. Open him up and go inside. Don't worry about raising vitals yet. When you're in, immediately fill up your syringe with the serum and inject it into the circle of Pempty cells before it disappears. After injecting once, switch to the stabilizer and raise vitals to max with a single injection on the right. Then switch back to the serum and inject the circle a second time. This will cause the Pempti core to reveal itself. Switch to your new laser now and begin burning the core.
Once you get the first OK it'll be time to fight Pempti mano a mano. To kill it, you have to keep burning the core with the laser. But Pempti defends itself by sending out its minions to wreak havoc on the secretary's lung. You can't ignore the minions or they'll kill Mr. Anderson in mere seconds. You have to kill them with the laser as well.
As a general rule, always, always, ALWAYS have your laser activated and right on the core when you're not dealing with minions. This is because this is where they come out from. you don't really know what Pempti will send out next, so having the laser activated and pointing on the core puts you in the best possible position to fight whatever it's going to send out on the shortest notice.
Now Pempti has 3 kinds of minions that it likes to send out. The first type are red mini-cores that cause lacerations. These are the ones that can cause the most damage if you don't take care of them, but they're also not too hard to deal with. Pempti will send 5 of these, one right after the other. They will move from the center (that is, where the core is located) to one of 5 spots around it, then shoot upwards after a second and create a laceration on the lung. You don't want this to happen. Your goal is to kill every one of these 5 small cores BEFORE they get a chance to create their laceration. This isn't hard to do if you're on the ball, but the timeframe from their creation to the laceration is a little bit strict so your laser NEEDS to be active and pointing at the core BEFORE it sends the first one out. Otherwise there's a good chance that you won't have enough time to kill it before it does damage. You can probably suture one or two lacerations if you're fast enough, but ideally you don't want to give Pempti a chance to create even ONE. The problem is that if you try to suture after all 5 of them have gone out, it's probable that you will not be pointing the laser at the core when it sends out the next wave, meaning you will NOT have time to deal with it, and you will be even closer to being overwhelmed. So it's in your best interest to kill these little guys immediately. To do this, as I've said before, have your laser burning the core before they come out. This makes it so that you start burning and causing damage to it as it's coming out, and you can follow its path with the laser up to one of the 5 points where it preps to make the laceration, burning it the entire time. If you do this, you will kill it before it does the laceration. But you can't relax because there's still 4 more to come after that one, so very quickly go back to the center and repeat the same thing for all of them. Remember, don't let even ONE of them get past.
The next type of Pempti minions are blue ones that cause tiny tumors. These are definitely the hardest ones to deal with. In fact, unless you're some kind of legendary surgeon it's very likely that you will not be able to kill all 5 of them before they create their tumors since they're so ridiculously fast. The good news is that you actually DON'T want to kill all of them. Truth be told, if you work too well there's a chance that you won't get a high enough chain to get the XS. Therefore, what we actually want to do is let some of these guys live so that they can create some tumors to help boost our chain. Now if you'll notice, the laser has an area of effect. This means that you can actually kill two of these little cores at the same time by pointing the laser BETWEEN them. If you're good, you can theoretically consistently kill 4 of them every time by doing this. But this is very hard to do and not even all the desirable. Ideally, you want to leave 2 or 3 alive so they create a lot of tumors that you can quickly treat. What I recommend doing is, as soon as all 5 come out, move your laser a bit upwards, and place it in between two of the ones on the top part. You should very easily kill those two before they create their tumors. Then, move on to burning a third one. It's very possible that you won't kill that third one before they go out, but don't worry about it. Like I said before, keeping them alive is actually to our benefit.
When the very short timeframe to kill them is up, they will spread upwards on the entire lung and place their tumors. You CANNOT actually kill them when they're in the middle of this, so instead of wasting time trying to burn them at this point, ignore them and start burning the tumors instead. Do it fast and make sure you get all or most of them, then very quickly gel the wounds up. These minions wait around for a little while after their initial attack, so after you've gelled up those tumors you have a choice as to how to proceed:
1) if you feel that you've treated the tumors suitably fast (this will usually be when there are only 1 or 2 of them alive), you can take the time to inject stabilizer once (twice if you want to push your luck) before switching back to the laser and killing off the survivors. This is pretty much the only time when you can raise vitals safely. I don't really recommend you raise vitals at any other time unless you're sure you know what you're doing.
2) if you feel that you haven't treated the tumors suitably fast (this will usually be when there are 3 or 4 of them alive), I recommend you just kill the survivors as soon as possible and wait for another chance to raise vitals.
The third type of minion Pempti uses is the least dangerous one. They are 5 mini cores that slowly come out in a spiral and start spinning around and causing damage. The thing is, these pose absolutely NO problem if you're pointing the laser at the core (which you should be). If you are, you don't need to do anything. All 5 mini cores will die as they're coming out before they have a chance to know what's up. No sweat.
In any case, that's how you fight Pempti. If you always keep the laser on the core you should be done before the time limit. Your only worry (other than dying), is your score. Do not break your chain at any time. And before you're done, make absolutely SURE that your chain is over 170 (close to 200 just to be safe). It's not enough to simply hit the 100 chain which gives you the special bonus. To get the XS you need to score over 6500 points. A chain below 170 has a low chance of netting you that much.