Where to Improve Your Ferrofluid Flask
Improve the Ferrofluid Flask at a Lantern: apply Power Upgrades for stronger healing per use and Empty Ferrofluid Flasks for more uses between rests. Find the materials in chests, buy stock from Louis at the Abandoned Church, or earn upgrades through The Curious Case of Seamus Diggory and The Oathbound.
If each drink leaves too much Health missing, look for power. If you keep running out before your next rest, prioritize quantity.
Apply the Materials at a Lantern
- Interact with a Lantern and apply your collected Power Upgrades or Empty Ferrofluid Flasks to improve the matching part of your healing supply.
- Keep collecting Power Upgrade materials as you explore. Later power improvements require more material for each upgrade.
All Ferrofluid Upgrades by Chapter and Lantern
The table covers 25 Power Upgrades and 9 Empty Ferrofluid Flasks, including purchases and quest rewards. Use the region, Lantern and landmarks to locate each upgrade.
| Upgrade | Chapter or Return Visit | Nearest Lantern | How to Get It |
|---|---|---|---|
| Power Upgrade | Regroup | Valley of Ashes > Guidepost | Past the tipped wagon, take the right cliff path. Break boxes left of the pole-swing platform; open the chest behind an enemy. |
| Empty Ferrofluid Flask | Regroup | Valley of Ashes > The Climb | Finish the bridge platforming section, then open the chest left of the Lantern. |
| Power Upgrade | Rendezvous | Fallen Village > Fields | At the split with a Grenadier by the right-hand gate, go toward the large house. Open the chest beside its well. |
| Power Upgrade | Rendezvous | Fallen Village > Marketplace | Enter the open village with patrolling enemies. Take the first left; the chest is inside the corner house. |
| Empty Ferrofluid Flask | Rendezvous | Fallen Village > Marketplace | Grapple across the water and past the two plague pillars. Open the chest to the right after the second pillar. |
| Power Upgrade | Dark Descent | Abandoned Church | Buy from Louis’ station for 3,000 Catalysts. |
| Empty Ferrofluid Flask | Dark Descent | Abandoned Church | Buy from Louis’ station for 5,000 Catalysts. |
| Power Upgrade | Dark Descent return visit | Valley of Ashes > Quarry | With grapple unlocked, ride the elevator up, grapple across and pull the crate. Climb past enemies to the chest near the zipline. |
| Empty Ferrofluid Flask | Dark Descent | Caverns > Old Mine | Cross using the crane box, then enter the left tunnel. Stop the spinning platform at the first left turn and cross to the chest. |
| Power Upgrade | Dark Descent | Caverns > Old Mine | Drop between the minecart tracks; follow the path behind the ladder. Operate the box lever, freeze the platform and cross to the corner chest. |
| Power Upgrade | Dark Descent | Caverns > Old Mine | Drop onto the return elevator’s middle ledge for the Mining Shaft Key. Unlock the door beside the minecart switch; descend to the chest behind a Volunteer. |
| Power Upgrade | Crime | Abandoned Church | Buy the additional stock from Louis’ station for 3,000 Catalysts. |
| Power Upgrade | Crime | Vale of Wrath > Under the Bridge | Jump from the bridge into the building’s roof. Find the upgrade beside the gears you freeze with Stasis to hold the gate open. |
| Empty Ferrofluid Flask | Crime | Vale of Wrath > Under the Bridge | Open the chest beside the tree with hanging bodies in the fishing village’s center. |
| Power Upgrade | Crime | Vale of Wrath > Ship Graveyard | Reach the ship with two central ramps. Turn around and search beneath the starting deck for a chest near three enemies. |
| Power Upgrade | Punishment | Cursed Hollow > Village Church | Jump right across the poison; look back and shoot the farther house’s upper weak point. Enter downstairs, climb and jump to the neighboring chest. |
| Power Upgrade | Punishment | Cursed Hollow > Village Church | Before the giant plague tree, enter the right building. Shoot through its window to release a carriage; climb it to the upper-floor chest. |
| Power Upgrade | Punishment | Cursed Hollow > Silent Cannons | Wallrun right of the cannon enemy to Seamus’s window. Collect blood from the pig or wine from the barrel in the animal-hanging shack; return to Seamus. |
| Empty Ferrofluid Flask | Punishment | Cursed Hollow > Village Church | Open the chest left of the shortcut leading back to the prior Lantern. |
| Power Upgrade | Witch Hunt | The Outskirts > Breach | Immediately beyond the boss area, open the chest on the descending slope. |
| Empty Ferrofluid Flask | Witch Hunt | The Outskirts > Market Square | Circle behind the barn to the larger house. Shoot barrels through its window, enter the wall opening and find the chest upstairs. |
| Power Upgrade | Witch Hunt | City of Orphans > Tribunal Square | From the house’s top floor with window weak points, follow the opposite path around the building. Defeat the courtyard miniboss and open its chest. |
| Power Upgrade | Witch Hunt | City of Orphans > Tribunal Square | Before the tower, open the central chest in the large area patrolled by a cannon enemy. |
| Power Upgrade | Witch Hunt | City of Orphans > Sewers | Grapple across the circular room. Go left toward the prone exploding enemy, then grapple into the room containing the chest. |
| Empty Ferrofluid Flask | Blasphemy | University > Main Hall | In the statue-and-staircases room, climb behind the stairs right of the statue. Shoot the weak point, pull the revealed switch and loot behind the statue. |
| Power Upgrade | Blasphemy | University > Main Hall | Return to the chandelier; take the poison hallway and descend the elevator. In the lower library’s right-hand statue room, collect the item to uncover the chest. |
| Power Upgrade | Blasphemy | University > Lift Shaft | After the elevator, turn left toward ceiling gas, then right. The exploding chest is at the hallway’s end, before a button. |
| Power Upgrade | Blasphemy | University > Lift Shaft | Reach the long platforming hallway above poison. At the far end, descend to the two explosive chests; open the right chest. |
| Power Upgrade | In Ruins | Abandoned Church | Buy the newly available upgrade from Louis for 3,000 Catalysts. |
| Power Upgrade | In Ruins | Fortress > Traverse | Turn back from the Lantern, follow the left path past enemies and keep left. Climb the stairs; turn immediately right behind boxes. |
| Power Upgrade | In Ruins | Fortress > Chapel | Below the pole-jump sewer room, take the left tunnels past the large gates. Defeat the lever-room enemies and climb for the Fortress Armoury Key; cross hanging platforms back and unlock the left door. |
| Power Upgrade | In Ruins | Fortress > Ramparts | Climb the stairs toward the two cannon enemies, then the right-hand ladder. Find the chest to the right near the dead end. |
| Power Upgrade | In Ruins | Fortress > Traverse | Below the Chapel’s pole-jump sewer room, descend opposite the large gate. Take the Captain’s Key from the end room’s right corner; unlock the building opposite Traverse’s cannons. |
| Empty Ferrofluid Flask | Reflection cleanup | Fortress > Courtyard | Finish The Oathbound: open the marked wall opposite the Guardsman’s room and read the table note. Open the chest left of the table. |
Which Routes Need Later Abilities?
- Return to Quarry with the grapple for its upper chest. The Marketplace Empty Flask also requires grappling across the water and plague pillars.
- Obtain Stasis at Weeping Ledge during Dark Descent, then use it for the moving-platform Power Upgrade and spinning-platform Empty Flask in Old Mine.
- After obtaining Shield, return through the University’s poison hallway for the lower-library statue chest. Shield also opens Adrien Cassell’s Oathbound route from Shamble Street.
- Revisit the Fallen Village Oathbound route with the grapple and Nephtoglobin formations. Collect the remaining emblems, then open the marked chamber at Fortress > Courtyard for its Empty Flask.
Missed Ferrofluid upgrades remain available after the story, so you can leave blocked routes and return with the abilities they need.