Mastering the Rat King Boss Fight in The Last of Us Part II Remastered

There are few moments in modern gaming that test your patience, your resource management, and your nerve quite like the encounter with the Rat King boss in The Last of Us Part II Remastered. I have spent dozens of hours inside the infected tunnels of Seattle, and I can tell you this: the rat king boss fight is not just a set piece. It is a deliberate, punishing exam of everything the game has taught you up to that point. On Grounded difficulty, with a no damage run as the goal, every single decision carries weight. One mistimed dodge, one wasted shotgun shell, and the run is over.

Naughty Dog designed this encounter as the culmination of Abby Anderson's journey through the hospital basement and the Aquarium. The boss arena itself is a cramped, flooded space littered with debris. The lighting is claustrophobic. Even in 4K HDR on a PlayStation 5, the shadows feel heavy. The Rat King boss does not behave like the other infected. It is faster, smarter, and it summons smaller runners to flank you. If you are attempting a no damage run, you need to internalize its attack patterns until they become reflex.

Understanding the Rat King Boss Fight

The rat king boss fight is a multi-phase battle. In the first phase, the boss charges directly at you, swiping with its elongated arms. It also spits blobs of fungal matter that explode on impact. The key here is spacing. Stay close to the pillars and use the environment to break line of sight. If you try to stand in the open, you will get hit. On Grounded difficulty, one hit from the Rat King boss takes roughly 80 percent of your health. That is not a typo. You cannot trade blows.

During the second phase, the boss climbs onto the walls and ceiling. It moves unpredictably, and it drops down directly on your position. This is where audio cues become critical. In 4K HDR with a good headset, you can hear the skittering before you see the movement. I recommend keeping a shotgun or a high-damage rifle equipped for these moments. The Chainsaw is also present in this area as a melee option, but I advise against relying on it. The wind-up animation leaves you vulnerable, and on a no damage run, vulnerability is death.

Weapon and Resource Strategy

Before you even enter the boss arena, you need to make sure you have enough ammunition and health items. The Last of Us Part II Remastered is generous with supplies on lower difficulties, but on Grounded difficulty, every bullet counts. I always bring at least two full magazines for my primary weapon and one for my secondary. The Seraphite, a rare pistol found later in the game, is excellent here because of its high stopping power. But you cannot depend on finding extra ammo for it during the fight. Plan accordingly.

• Use explosive arrows or pipe bombs to stagger the boss when it charges.
• Save your pistol ammo for the smaller infected that spawn during phase transitions.
• If you have a smoke bomb, use it to create a brief window to reposition.
• Never stand still for more than two seconds. The boss punishes static play.
• Keep an eye on the collectibles in the room. Some hold lore items from the WLF and the Firefly factions.

The collectibles in this area are not just flavor text. They tell the story of how the outbreak spread through the hospital and how the military tried to contain it. On a completionist run, you will want to grab every note and artifact. But during the rat king boss fight, you cannot afford to stop and read. Pick them up after the encounter ends. The game saves your progress after each phase, so you can backtrack for collectibles once the boss is dead.

Adapting to Grounded Difficulty

Grounded difficulty changes the rules. Enemies deal more damage, but they also react faster and have better hearing. The Rat King boss is no exception. On Grounded, the boss's charge attack covers more ground, and its spit attack has a wider spread. You need to be more aggressive with your dodges. I found that sprinting diagonally toward the boss and then sidestepping at the last second works better than trying to dodge straight backward. The hitbox on the charge is wider than it looks.

Another factor on Grounded is the reduced availability of crafting materials. You cannot rely on finding bandages or alcohol in the arena. If you take even a single hit, you are in serious trouble. That is why a no damage run requires perfect execution. There is no margin for error. You have to treat every phase of the rat king boss fight as a separate puzzle, each with its own timing and rhythm.

Comparative Difficulty: Ellie vs. Abby

Players who have completed The Last of Us Part II Remastered know that this encounter is unique to Abby Anderson's campaign. Ellie Williams never faces a Rat King boss. Her journey through Seattle and Jackson Hole is intense, but it focuses more on human enemies and stealth. The Rat King boss fight is designed specifically for Abby's strengths: raw power, heavy weapons, and close-quarters combat. If you are used to Ellie's playstyle, you may need to adjust your approach. Abby is slower but hits harder. Use that to your advantage.

The boss arena itself is a modified hospital wing. The lighting in 4K HDR with HDR10 support makes the fungal growths on the walls look almost luminous. It is a visual achievement, but it also serves a gameplay purpose. Those glowing patches mark where the boss has been, giving you a visual clue about its movement patterns. Pay attention to them. They are not just decorative.

The No Damage Run Challenge

Attempting a no damage run of the rat king boss fight is a test of endurance. I have seen speedrunners and challenge players spend hours on this single encounter. The key is to break the fight into segments. Focus on surviving the first phase without taking a hit. Once you have that down, move to the second phase. Do not try to perfect the entire fight at once. Build muscle memory piece by piece.

One technique that helped me was using the environment to funnel the boss. The pillars in the center of the room create natural choke points. If you stand behind one and bait the boss into charging, it will get stuck for a moment, giving you a clean shot at its exposed back. This works on Grounded difficulty as well, but the timing is tighter. You have to start moving before the boss finishes its charge animation.

Another tip: do not waste ammunition on the boss during its climb phase. Wait until it drops down and commits to an attack. Shooting at it while it is on the ceiling is inefficient and leaves you with less ammo for the final phase. The final phase is the most chaotic. The boss summons multiple infected at once, and the room becomes a whirlwind of movement. Stay calm. Prioritize the smaller targets first, then focus on the main body. One well-placed explosive can clear the area.

Why This Fight Matters

The rat king boss fight is more than a mechanical challenge. It is the emotional climax of Abby's story. After everything she has been through - losing her friends, fighting the WLF, surviving the Seraphite - she faces this monstrous embodiment of the infection that started it all. The Clicker, that iconic device from the first game, is not present here. Abby has to rely on her own instincts. That is what makes the encounter feel personal. It is not just about survival. It is about confronting the source of the pain that has defined her world.

For players collecting every artifact and completing the game on the hardest settings, this boss fight is a rite of passage. It separates those who have mastered the mechanics from those who are still learning. On PlayStation 5, with the 4K HDR visuals and smooth performance, the fight looks and feels better than ever. The Remastered version adds subtle graphical enhancements that make the boss's movements more readable. The HDR10 support brings out the contrast between the dark corners and the bright fungal growths.

If you are struggling with the rat king boss fight, take a break. Come back with a fresh mind. Watch the patterns. Respect the boss's reach. And remember: every no damage run starts with a single perfect dodge. Once you get that first phase down, the rest will follow. It takes patience, but the satisfaction of seeing that final cutscene without a single health bar flicker is worth every failed attempt.