Plasmium Phial |
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| Spear-phial containing Plasmium. Injecting the liquid allows one to gain health beyond their natural limits. |
Plasmium Phial is a Tool in Hollow Knight Silksong. Plasmium Phial is a Red Tool in Hollow Knight: Silksong that lets Hornet inject Plasmium to temporarily gain health beyond her natural limit. Tools are special collectibles used by Hornet, giving her offensive and defensive abilities.
How to Get Plasmium Phial Tool in Hollow Knight Silksong
- Location: Wormways [Silksong Map]
- Complete Alchemist Zylotol's Wish quest, "Alchemist's Assistant".

Hollow Knight: Silksong Plasmium Phial Tool Information
- Tool Effect: Spear-phial containing Plasmium. Injecting the liquid allows one to gain health beyond their natural limits.
- Tool Type: Support
- Tool Characteristic:
Red Tool - This tool item holds up to 6 uses before it must be refilled.
Plasmium Phial Tool Notes & Tips in Hollow Knight Silksong
- After filling out the Needle Phial with the Plasmium sample, you will bring it back to Alchemist Zylotol to complete the wish.
- Upon completion, the Plasmium Phial will be given to you by Alchemist Zylotol.
- The Plasmium Phial has reserves and the actual Tool item can be replenished whenever you rest at a bench.
- To refill the reserve, you can ask Alchemist Zylotol to refill it in exchange for Rosaries.
- When you gain 9 lifeblood masks, all of them disappear and all of your regular masks are converted into regenerating lifeblood masks.
- While in this state you are unable to gain additional lifeblood masks, though attempting to gain more while a lifeblood mask is regenerating will regenerate it immediately.
- Binding will only regain one lifeblood mask, binding using the multibinder tool regains 2 lifeblood masks.
- Speaking to Yarnaby in this state has her mention that she doesnt treat those who benefit from their afflictions.
- To get rid of this state you can: sit on a bench (including dying or benchwarping as these actions make you sit on a bench), use the needolin to warp to a bellway, or use a bellway.
AnonymousThis thing is kinda OP..helped me at mount fay..beating ugly chef boss with poison stat..basically im using it whenever im desperate while sitting on a bench..
the sad thing is im justt too lazy refilling them whenever they ran out, until unless im in a difficult situation again loll ( wasnt using architect)..i recommend using this whenever you are having a difficult situation. Like me .might helps alot
AnonymousI get that Quicksling does not affect flea brew, but when not heal 2 plasmium?? Does not make sense.

AnonymousUsing Plasmium Phial while Polip pouch equipped causes Hornet to gain a purple mask, which after a time, explodes causing a purple mist to appear.

Anonymous
I really wish the regenerating health weren't so stupidly easy to get rid of (can't rest or fast travel at all).

Anonymousalso theres a secret interaction with the bug that heals your cursed gray roots (i forget her name) where she says that she only heals things that dont have upsides or whatever (hornet mentions the healing properties). also note that you do not need the architect crest to be able to do this as after the lifeblood has spread more in wormways there are two cocoons (that i know of) where you can get up to 4 lifeblood hearts. that combined with the maximum of 6 uses of the phial means you can get up to 9 lifeblood hearts (you can do 10 but it stops at 9 obv) without needing to repair the phial. its a shame that this state is so easy to get rid of because its very fun with witch's crest (because its hard to heal with anyways so it provides an easier way to heal) and shaman's crest (you have little reason to bind so you can spend your silk on silk skills alone)

Anonymousother things that reset the state are using a bellway or warping to one with the needolin

AnonymousThings to note about the Plasmium Phial and the replenishing Blue Masks after using the Architect Crest to give 9 Blue Masks:
You go back to your normal # of masks but they are Blue and will take ~7 seconds for the last one to regenerate. Turning all your normal masks blue will full heal your entire health bar. This cooldown is reset when you are hit. Sitting at a bench, restarting from load, or dying will reset you to normal masks. You may still use silk to heal but you will only heal 1 mask instead of the normal 3 (this becomes a 2 mask heal if Multibinder is equiped). Binding also interrupts the blue mask regeneration cooldown. Further use of the Plasmium Phial does not add any more masks past your normal amount once all blue.
You can technically make a "No Bench Build" with the Druid's Eye(s) being able to regenerate health, and there for silk, infinitely. You could use the creatures that respawn when you leave a room to technically infinitely farm for Bone Shards to replenish for tools.
Will keep testing, hope this helps! db
Anonymousappears you cant get this without using a simple key to unlock the wormway door (although you can get to worm way and wanderer crest without using the simple key). In case anyone else used the first get on Deep Docks instead, like I did.

Anonymous....equip on architect and inject 9 times, your whole health now is a regenerating blue masks.

AnonymousThere seem to be a bug that can happen when you get the infinite refill gland in act 3 while the phials are empty with no reserve. They will not refill ever and are basically unusable until a patch comes out to fix it. So make sure not to have it empty when finishing the advanced alchemy quest.

AnonymousThere's a secret if you inject nine using the architect crest. Its worth it trust.


Im not sure if its a bug but if you use architects crest to replenish ur Plasmium Phial when u dont have any in your reserve, it just uses up all your shell shard without doing jackshit. Thank you Team Cherry as always
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