Silksong Tools & Guides
Silksong

Needle Phial – Hollow Knight: Silksong Red Tool

TEMPORARY EXTRACTION TOOL FOR ALCHEMY QUESTS

A temporary Red Tool designed to extract and store fluids. Must be charged to full tension before piercing targets. Essential for completing the Alchemist's Assistant quest in Wormways.

Needle Phial red tool icon from Hollow Knight Silksong showing extraction needle design
ACT 1
WORMWAYS (Alchemist's Assistant)
EXTRACT
QUEST
TEMPORARY
1
SLOTS
3
BUD SAMPLES

IMPACT STATS

DAMAGE
0%
SURVIVAL
10%
MOBILITY
5%
UTILITY
100%
ECONOMY
80%

ACQUISITION (ALCHEMIST'S ASSISTANT)

Method:Quest reward (temporary)
NPC:Zylotol (Alchemist's Assistant)
Location:Wormways
Requires:Simple Key + Alchemist's Assistant quest

Use a Simple Key to access Wormways, find Zylotol in his lab, and accept the Alchemist's Assistant quest to receive the Needle Phial.

DESCRIPTION

A temporary Red Tool designed to extract and store fluids. Must be charged to full tension before piercing targets. Used to collect 3 Plasmium samples from blue-glowing buds in Wormways for the Alchemist's Assistant quest, and Plasmified Blood from enemies for Advanced Alchemy.

Essential for Alchemist's Assistant quest progression
Charging mechanism: hold until 'click' sound, then release
Temporary tool: returned to Zylotol after quest completion

QUEST PROGRESSION

Alchemist's Assistant

Extract 3 Plasmium samples from blue-glowing buds in Wormways to unlock Plasmium Phial

Advanced Alchemy

Extract Plasmified Blood from 10 enemies to unlock Plasmium Gland for infinite refills

Tool Return

Zylotol takes back the Needle Phial after completing both quests; doesn't count toward Arsenal

HOW TO USE

1

Charge the Needle Phial

Hold the tool button until you hear a 'click' sound

2

Find Blue-Glowing Buds

Look for 3 Plasmium buds in lower Wormways areas

3

Pierce and Extract

Release the button to pierce the target and collect the sample

NEEDLE PHIAL VS PLASMIUM PHIAL COMPARISON

ToolTypeFunctionDurationArsenalPurpose
Needle PhialRed ToolExtractTemporaryNoQuest tool for collecting Plasmium samples
Plasmium PhialRed ToolInjectPermanentYesCombat tool for blue mask regeneration

FREQUENTLY ASKED QUESTIONS

A: The Needle Phial is a temporary Red Tool designed to extract Plasmium from buds and Plasmified Blood from enemies. It's essential for completing the Alchemist's Assistant quest.

A: Hold the tool button until you hear a 'click' sound, then release to pierce and extract. The tool must be fully charged before it can extract anything.

A: Find Zylotol (Alchemist's Assistant) in Wormways and accept the Alchemist's Assistant quest. He'll give you the Needle Phial as a temporary tool.

A: Needle Phial extracts Plasmium (quest tool, temporary), while Plasmium Phial injects Plasmium for blue masks (combat tool, permanent). They're different tools in the same alchemy line.

A: No, Zylotol takes back the Needle Phial after completing both Alchemist's Assistant and Advanced Alchemy quests. It doesn't count toward your Arsenal achievement.

A: Some players report a controller charging bug, especially in Act 3. Try switching to keyboard temporarily as a workaround (community-reported issue).