Conventional wisdom in Dead by Daylight is that killers should try their hardest to prevent survivors from completing generators, ideally hooking and killing them all before the last generator is complete.
However, that is not always possible, especially at high ranks, but the developers at Behavior have accounted for this by including perks that encourage killers to play the long game empowering the killer as the game goes on and the generators are completed. With these perks, some careful planning, and a little luck, you can become a much more terrifying killer at the end of a match.
10 Coup De Grâce
Though it's tricky to manage, Coup De Grâce is a potent tool for any killer, granting them some truly epic long-range lunges every time a generator is completed that will have inexperienced survivors wondering how they got hit. The perk is flexible enough to run it without holding it for endgame, which is good because sometimes, you need to lunge to secure a down.
However, it really shines when used by killers who have ways to down survivors without basic attacks like Demogorgon, Trapper, or either of the chainsaw killers or if you're excellent at getting non-lunge basic hits. By the time they can start thinking about powering the exit gates, survivors may find themselves up against a killer with up to five impossibly long lunges to deal with alongside everything else in an endgame build.
9 Fire Up
Perhaps one of the most straightforward endgame perks, Fire Up, starts inconsequential but becomes more powerful as generators get completed, granting killers a stackable speed buff to break things, pick up or drop survivors, and vault over objects.
It might take a few generators lost for the effects of this perk to be noticeable, but by the time the last one is done, survivors may find their defenses - vaulting windows and dropping pallets - to be much less effective as you quickly hop over through windows and chewing through pallets rather quickly, especially since the gains from Fire Up stack with other perks, add-ons, and killer abilities. A Tier Three Michael Meyers with Bamboozle and Brutal Strength would be a terror to behold.
8 Hex: Undying
In Dead by Daylight, information is king and a lot of your decisions are based on who you know is where. Given the popularity of Boon perks, which force survivors to interact with totems, Hex: Undying is in a strong place, netting you the information you need to act since this perk reveals the aura of survivors within a four-meter radius of a dull totem.
However, that isn't even the best part of this perk. The best thing about it is its ability to preserve other powerful Hex perks like Hex: Ruin or Hex: No One Escapes Death.
7 Rancor
Rancor periodically provides you with info throughout the match, with the caveat that the Obsession will learn where you are at the same time you learn where everybody else is. The information is powerful, though it's tempered somewhat by the fact that at least one person knows where you are every time a generator pops, more if they're on comms and most experienced survivors will know that you're running this perk and act accordingly.
What really makes Rancor shine is that after five generators are done, the Obsession becomes permanently Exposed– downed in one hit and you can kill them with your Mori regardless of their hook states, forcing them to act defensively and avoid altruism at the risk of being immediately killed.
6 Remember Me
A good perk that is deceptively difficult to use and is completely overshadowed by No Way Out, Remember Me is still a powerful tool in any endgame build potentially adding up to 16 seconds to the exit gate powering time. This perk works best if you stack it as quickly as possible by landing four hits on the Obsession and getting rid of them ASAP, so everyone let will have to take up to 16 seconds longer to open the exit gates, but the trickiness lies in the fact that the Obsession can change throughout the game because of certain perks.
You don't want to run anything that will change who the Obsession is like Nemesis or Furtive Chase, but Survivors can also change the Obsession with Decisive Strike or For the People.
5 Save The Best For Last
While this perk isn't good for every killer, it can be devastating when it works. Whether you're playing for endgame or not, Save The Best For Last is absolutely beastly on some killers, with the faster cooldowns after you land a hit leading to especially short chases on some of the more killer-sided maps. This perk works best on killers who use special attacks but don't get most of their hits from them, like Pig, Trapper, or Demogorgon.
As long as you can land basic attacks on the non-Obsessions and don't hit the Obsession too often with basic attacks, you should be landing hits and getting downs efficiently. When it's time to stop playing around, finish off the Obsession and enjoy your permanent attack cooldown buff against the rest of the survivors.
4 Bitter Murmur
Bitter Murmur is another source of reliable information for killers. Since the primary goal of survivors is to fix the generator, more than one of them will be working on a generator when it's fixed, and even if there's only one working on it, you at least know where one is, plus anyone who is within that 16-meter radius.
After the last generator is complete and the real work begins, you'll briefly know where everyone is, enough time to figure out which exit gate everyone's going to or who's being rescued.
3 Blood Warden
Blood Warden is a powerful perk, albeit one that can be tricky to work with and requires a bit of good luck and skill to deploy. What makes it so tricky is that you have such a limited window to make a Blood Warden play happen, having to down and hook somebody basically right before everyone else escapes.
Still, if you can pull it off, you have a decisive advantage, with survivors not even being able to think about leaving for a full minute, likely a death sentence if you're kitted for the endgame.
2 No Way Out
This is one of the best endgame perks available for killers and is a straight-up upgrade to Remember Me in every way save for the ease of stacking tokens on it.
Since this perk blocks the exit gate switch outright instead of increasing the timer to power it up, No Way Out is immune to survivor perks that speed up powering the gate, such as Wake Up!, Spine Chill, or Resilience. Fully stacked, this perk blocks the exit gate switches for a full minute. While it's pretty powerful on its own, it can be genuinely oppressive when used with Remember Me and Blood Warden for a grand total of two minutes and 16 seconds of stranded survivors.
1 Hex: No One Escapes Death
Arguably the most powerful killer perk in Dead by Daylight, even at the worst-case scenario, this perk is well worth its place in your loadout. Unless you have truly abysmal luck, run into a huge skill gap, or ended up in the Raccoon City Police Station, you guaranteed at least one kill and are likely to get more with Hex: No One Escapes Death.
This perk is so powerful, in fact, that it has a bad reputation in the DBD community, especially amongst survivor mains, somewhat justified since once this is deployed after all the generators are done, there is little counterplay for them to do.
On top of making every survivor exposed and vulnerable to a single hit, you also get a nice little move-speed bonus to make hunting them down that much easier. On its own, this perk can turn the worst games around to complete four-kill wins, but if you make it a linchpin in your endgame build, you become an absolute monster, proving this perk's name true. Just be prepared for some extra salt in the post-game chat.