Where is Silksong Plasmium? This strange elixir has some seriously powerful properties, but dont take our word for it. What initially seems like an innocuous quest item gives you access to one of the most powerful tools at Hornets 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 Zylotols laboratory at the top of the area. Speak to him twice to accept the Alchemists 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.Read the full story on PCGamesN: How to get Hollow Knight Silksong Plasmium