Resident Evil 9 Requiem: How to Use the Hemolytic Injector

The Hemolytic Injector is Grace Ashcroft’s cleanest way through the Rhodes Hill Chronic Care Center. It is a syringe of a drug that ruptures infected blood cells, and it does two useful things at once. Injected into an unaware or staggered enemy, it kills instantly and quietly. Injected into a downed corpse, it stops that body from later mutating into a Blister Head.

Quick answer: Crouch, sneak directly behind an enemy that has not noticed you (or one you have already staggered), and press the prompted melee button to inject. Grace kills it on the spot with no noise.

What the Hemolytic Injector does

The in-game description reads: “A special drug that destroys infected blood cells. Prevents corpses from mutating and can be used to stealthily take out enemies.” In practice, a regular infected that gets injected convulses and combusts, so there is no body left to reanimate. That is why it doubles as a way to stop future Blister Heads from spawning in rooms you keep passing through.

The item is exclusive to Grace. It works on most enemies, including Lickers taken from behind, but it will not one-shot the largest foes. The obese Chunk in the East Wing needs three injectors to go down if you have not already worn it down another way.

Where to find the first Hemolytic Injector

You pick up your first one for free inside the Examination Room, on the first floor of the Care Center’s East Wing. You need the East Wing Keycard to reach it. Cross the body lying on the bed and grab the injector from the bench or table beside the sink before you deal with the doctor zombie and the second one that stands up nearby.

Care Center map open, marking the Examination Room in the East Wing where the injector sits — The Care Center map points to the Examination Room, where the first Hemolytic Injector waits on a table. Image credit: Capcom / via @MistaWigglez

That first pickup only exists once. Everything after it comes from crafting, so treat the free one as a chance to learn the timing rather than a resource to hoard.

How to craft more injectors

Each Hemolytic Injector costs one Scrap plus 60 Infected Blood. Before you can build them, analyze the purple Blood Sample vial at the Blood Lab in the East Wing to unlock the recipe. After that, you craft directly from the menu whenever you have the materials.

Material	Amount	Where it comes from
Scrap	1	Found around the Care Center, including the Waiting Room and adjacent Closet
Infected Blood	60	Drawn from blood pools and buckets using the Blood Collector

The Blood Collector is Anthony Richardson’s custom-ordered tool, and it is what turns the environment’s blood into the 60 units each injector needs.

Items menu with the Blood Collector selected, showing its description — The Blood Collector in the Items menu; use it to extract the Infected Blood each injector requires. Image credit: Capcom / via @MistaWigglez

Scrap is the tighter constraint of the two. You can gather it as you explore, and the Waiting Room together with its neighboring Closet are reliable early spots.

Area map showing the Waiting Room, a dependable Scrap location in the Care Center — The Waiting Room, one of the early Scrap spots for crafting more injectors. Image credit: Capcom / via @MistaWigglez

How to use it for a stealth kill

The injector only produces an instant kill when the target cannot fight back. That means one of two states: the enemy has not noticed you, or you have already staggered it. Approach from behind and watch for the melee prompt to appear.

Crouch to stay quiet and close the distance behind an enemy that is unaware of you. Keep out of its line of sight until you are directly behind it.

Wait for the injection prompt to show, then press the melee button. Grace drives in the syringe and the enemy combusts on the spot.

If an enemy already knows you are there, stagger it first with a shot or hit, then close in and inject while it is reeling. The same one-hit result applies in that window.

You know it worked when the target violently convulses and burns away, leaving nothing behind to reanimate. No alarm spreads to nearby enemies, which is the whole point of using it over a loud kill.

Note: If no prompt appears, the enemy has spotted you and is not staggered. Break line of sight or stagger it before trying again. On a downed but still-present body, the same injection prevents it from turning into a Blister Head.

Best target: the Chef and the Pantry Key

The standout use for an injector is the Chef. Killing him drops the Pantry Key, described as “A key with a tag that says ‘Pantry.’ It’s sticky to the touch.” He patrols a fixed loop through the Kitchen, Parlor, Dining Room, and Cold Storage, so you can time an approach instead of fighting him head-on.

Care Center map used to trace the Chef's patrol between the Kitchen, Parlor, Dining Room, and Cold Storage — The Chef’s patrol runs through the Kitchen, Parlor, Dining Room, and Cold Storage. Image credit: Capcom / via @MistaWigglez

Track the Chef down to the hallway near Cold Storage and read where he is heading on his patrol route.

Care Center map showing the current position near Cold Storage while lining up the stealth approach — Line up the stealth approach near the Cold Storage hallway before the Chef comes past. Image credit: Capcom / via @MistaWigglez

Vault through the window into the storage room to hide, and wait for the Chef to walk past the opening.

Once he has passed, vault back out quietly, crouch, and sneak up right behind him.

Press the injection prompt to kill him instantly, then collect the Pantry Key from the blood on the floor.

Pantry Key pickup prompt shown over the blood-covered floor where the Chef fell — The Pantry Key prompt appears on the floor after the Chef goes down. Image credit: Capcom / via @MistaWigglez

When to save your injectors

Because 60 Infected Blood and a Scrap add up quickly, spend injectors where the payoff is clear rather than on every wandering zombie. Silent removals like the Chef, and enemies you genuinely cannot beat another way, are the strongest use. Keep in mind the size limit: the biggest foes shrug off a single dose, and the Chunk needs three injectors unless you soften it up first.

Used with a little patience, a single syringe clears a threat, keeps a room quiet, and stops a corpse from coming back as something worse. That combination is what makes it worth carrying through the Care Center.