How to get Hollow Knight Silksong Plasmium

Where is Silksong Plasmium? This strange elixir has some seriously powerful properties, but don’t take our word for it. What initially seems like an innocuous quest item gives you access to one of the most powerful tools at Hornet’s disposal, provided you complete the quest first. You can only get Plasmium in Hollow Knight Silksong once you speak to Alchemist Zylotol in the Wormways. Use a Silksong Simple Key to gain access to this location on the Silksong map, then proceed to Zylotol’s laboratory at the top of the area. Speak to him twice to accept the ‘Alchemist’s Assistant’ side quest and receive the Needle Phial. This is a Silksong Tool, so use the bench to the far left of Zylotol to equip and use it before you head out.

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