In Hollow Knight: Silksong, Lost Fleas are small, collectible creatures scattered throughout the kingdom of Pharloom, often trapped in environmental hazards like cages, vines, crystals, or hidden behind obstacles. Notable variants include unique fleas like Kratt and Vog.
Collecting Lost Fleas directly ties into the "Flea Caravan" progression system, a side activity that unlocks story beats, minigames, and upgrades.
As you collect them, the Flea Caravan can travel to new camp:
- 5 Fleas (The Lost Fleas wish) - Moves from The Marrow to Greymoor
- 14 Fleas, including Kratt + open Grand Gate - Advances to Blasted Steps
- 22 Fleas, including Vog + read the Needolin Lore - Relocates to Putrified Ducts / Fleatopia
