
After spending a full evening looping around the East Wing as Grace, I got completely sick of Chunk. Every time I tried to backtrack for items or explore a new room in the Sanatorium, that walking mountain of meat was blocking a corridor and forcing me to route around him. I originally assumed he was a pure “stalker” enemy you were meant to avoid like a classic Tyrant.
The breakthrough came when I realized two things:
Once I understood that, I stopped treating him like an annoyance and started treating him like a proper boss. This guide walks you through how I reliably kill Chunk now: what to bring, where to fight him, and how to avoid wasting ammo and heals like I did on my first attempts.
Chunk is a Grace-only “Goliath” type enemy that patrols the Sanatorium’s East Wing. You first properly encounter him on the upper floor: a massive, swollen creature that fills the narrow hallways and will happily body-block entire routes.
What makes Chunk dangerous is not complex patterns but the combination of his huge health pool and the cramped environment. If you try to fight him in a tight corridor, you’ll get cornered, grabbed, and probably panic-heal until you’re out of resources.
So the real fight starts long before the first bullet: you win this encounter by choosing when and where to engage him.
On my first run, I made the mistake of trying to “prove a point” and fight Chunk as soon as I realized he was killable. That cost me almost all my pistol ammo and half my healing stock, which I regretted about 20 minutes later.
From my later playthroughs, here’s when I recommend tackling him:
If you’re playing on higher difficulties (Hard/Nightmare), it’s worth doing a quick resource loop first: check side rooms, smash every crate, and make use of crafting in the pause menu via Options → Crafting when you’re in a safe spot.
TL;DR: Don’t rush the fight. Take 10-15 minutes to shore up ammo and heals-the Overseer talisman is great, but not if you crawl into the next section broke.

Your exact gear will vary depending on how you’ve been playing Grace, but this baseline has worked well for me across difficulties:
Also, make sure your inventory is tidy before the fight. I lost a run because I picked up a drop mid-fight and the full-inventory popup got me grabbed. Do a quick clean-up in Inventory → Arrange ahead of time so you’re not wrestling the menu mid-battle.
This next step is where most people fail—you absolutely should not try to kill Chunk in the narrow corridor where you first bump into him. That’s a recipe for getting cornered with no dodge room.
Instead, you want to:
Once you’ve picked your arena, lure Chunk there:
Pro tip: If there’s a room with a central object you can circle, that’s ideal. You can break line of sight for a second to reload or heal while he trudges around the obstacle.
Chunk isn’t complex, but understanding his basic moves makes the fight much safer. Here’s what I consistently see from him:

The key is to maintain a medium distance: close enough that most shots hit his soft tissue, but far enough to sidestep lunges and grabs.
As soon as Chunk crosses the threshold into your chosen room, hit him with your best opener:
This front-loads damage and often pushes him into a brief stagger. Don’t overstay, though—once he starts moving again, switch back to your handgun and kiting loop.
Once you’re in the rhythm, the fight becomes a predictable loop:
On my successful runs, I rarely fire more than three shots in a row without moving. The big mistake is getting greedy and tunnel-visioning on his HP—Chunk punishes standing still.
After enough focused damage, Chunk will visibly flinch or slow, and occasionally he’ll slump partway down. These are your money moments:
I tried “going full melee hero” on one attempt and paid for it with a one-two combo that burned two heals. Think of melee as a finisher or bonus damage, not your main plan.
At some point you’ll take a hit; it happens. The important part is when you heal:
If he lands a grab and you barely survive, that’s when you use your strongest heal. The Overseer talisman you’re earning from this fight will eventually help with those clutch survivals, but you don’t have it yet—play safe.

Here are the errors that cost me the most retries:
Once you’ve pumped enough lead and acid into him, Chunk will finally collapse in a big, messy heap. Don’t forget to loot and check your rewards; here’s what you gain for all that effort:
That last point is underrated. The psychological relief of knowing you can take your time in those tight hallways without a living atrocity breathing down your neck is huge. It also makes it far easier to sweep the area for any remaining items or lore you might have missed while running from him earlier.
Chunk felt borderline unfair the first time I met him—an unkillable wall of flesh turning every trip down the East Wing into a gamble. Once I understood that he was a killable mid-boss with real rewards, the whole section clicked into place.
If you set up a good arena, pace your shots, and resist the urge to face-tank him, the fight becomes manageable, even on higher difficulties. The Overseer talisman will then pay you back for the rest of the game by turning potential deaths into narrow escapes.
Take a bit of time to prepare, stick to the kiting strategy, and don’t panic when he closes the gap. If I could turn this walking nightmare into a permanent corpse with my first clumsy attempts, you can absolutely do it too—and once he’s gone, the Sanatorium’s East Wing finally feels like your territory instead of his.
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