
Do you remember stumbling upon a seemingly unremarkable door with a simple lock while playing Hollow Knight: Silksong? Have you ever wondered, “What secrets lie behind it?” The answer may surprise you—a connection to the beloved Hollow Knight game awaits!
Upon entering the hidden doorway in the Wormways, you will encounter a bug dedicated to studying Lifeblood, affectionately referred to as Plasmium. Your adventure begins with a mission to navigate the narrow, winding corridors of the Wormways in search of this mysterious substance. If you have a penchant for battling voracious, flesh-eating worms, then you’re in for a treat. If not, no worries—read on to discover how to quickly gather three Plasmium samples and escape back to the vibrant world of Hollow Knight: Silksong.
Locating the Quest

Your first task is to find a Simple Key. This key can be discovered in various locations throughout the Pharloom universe, but the simplest one to acquire is at the beginning of the game, available for purchase from a vendor in Bone Bottom for 500 Rosary Beads.
Additionally, before exploring this area, ensure you have the Cling Grip, which can be acquired in Shellwood. This item is essential for navigating the Wormways efficiently.
To access the Wormways, head directly west of Mosshome. You will need to leap across a gap secured by two overhead cages. Continue west until you spot a large door, unlock it with your Simple Key, and enter.

Once inside, make your way upward. At the top of the vertical shaft, you will encounter Alchemist Zylotol, who will grant you the Wish.
Collecting the Plasmium Samples
Sample 1: The First Bud

Before descending from Zylotol’s location, be sure to equip the tool that he provided, using the bench on your left. This counts as a red tool in your inventory and is activated similarly to a Sting Shard.
The first Plasmium bud is located directly below Zylotol. Be vigilant! Watch out for the small worms that emerge from the ground, as they can inflict damage. If you have the Crest of the Wanderer, utilize quick slashing to fend them off.
If your health is dwindling, strike at the numerous worms descending from the ceiling. While they can’t be defeated, you can regenerate some health by attacking them.
Sample 2: The Second Bud

The next bud is nestled low at the base of the Wormways, where it seamlessly blends into the surrounding Moss Grotto. Descend further east until you notice a greenish hue, indicating you’re heading in the right direction. Navigate through a brief corridor to discover the second bud.
While at this location, consider unlocking the nearby shortcut that leads back to the Moss Grotto.
Sample 3: The Final Bud

The last bud is located in a spacious chamber to the southwest. Seek it out on the far left after entering the westernmost room. Collect the final bud and make your way back to Alchemist Zylotol.
Rewards for Completing the Quest

Upon your return, Zylotol will greet you enthusiastically and present you with a Plasmium Phial.
This phial acts as a red tool that can provide you with an additional temporary mask of health, offering three uses each time it is activated. It replenishes upon resting at a bench, totaling 20 uses available. Once depleted, you can revisit Alchemist Zylotol to refill your phial in exchange for rosary beads.
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