The Lost Fleas quest is a crucial side mission in Hollow Knight: Silksong that rewards you with access to the new Greymoor area and is vital for progression towards the true ending. This guide provides the exact location of all five lost fleas.
How to Start the Quest
- Location: Very early in the game, head to Bone Bottom village.
- Accept the Quest: Find and inspect the quest board to accept “The Lost Fleas” wish.
- Speak to the Caravan: The quest instructs you to find the Flea Caravan, located in The Marrows (the area directly after Bone Bottom). Speak to the NPCs there to officially begin your search.
Lost Flea Location #1: The Marrows
- Area: The Marrows (Upper-Left Section)
- Directions: From the main Marrows pathway, head upwards and to the left. Navigate a series of platforms, baiting or fighting enemies along the way. You will need to drop down onto a specific platform on the left side to find the flea trapped in a cage.
- Note: This one is found naturally as you progress through the area.
Lost Flea Location #2: Hunter’s March
- Area: Hunter’s March (accessed from the right side of The Marrows)
- Difficulty: CHALLENGING. Use the nearest bench and spend your Rosaries before attempting.
- Directions: This is a demanding platforming challenge requiring precise downward attacks (pogo) on specific objects and enemies to ascend.
- Navigate through initial spikes by pogoing off red fungi.
- A difficult section requires a sequence: down-right, down-right, down-left, down-left, down-right, and up.
- The final stretch involves going left, then up to the cage.
- Pro Tip: Be precise with your control stick to ensure downward attacks instead of side attacks.
Lost Flea Location #3: Deep Docks (Upper Level)
- Area: Deep Docks
- Prerequisite: You must have the Swift Step (dash) ability.
- Directions: From the Deep Docks entrance, head left. Use your dash ability to glide over gaps and reach a higher platform. The flea cage is easily accessible here.
Lost Flea Location #4: Deep Docks (Lava Tunnel)
- Area: Deep Docks (Near a fast-travel station)
- Directions: Find a breakable wall on the left side of a large room. Break it to enter a tunnel over lava.
- Challenge: Time your jumps between the rising and falling lava geysers. Jump across the platforms, defeat a flying enemy, and patiently wait for lava intervals to safely reach the flea cage on the far side.
Lost Flea Location #5: Far Fields
- Area: Far Fields
- Directions: Use the fast travel to Far Fields and head all the way to the left. Stay on the upper platforms until you find a section with a breakable (fake) wall.
- Inside: Break the wall and proceed right. Be prepared for a trap that will lock you in a room with an enemy—defeat it to proceed. Continue right and upwards to find the final flea cage.
Completing the Quest & Rewards
- Return to the Caravan: Once all five fleas are freed, return to the Flea Caravan in The Marrows.
- Speak to the NPC: Hand in the quest to complete it.
- Travel to Greymoor: The caravan will offer to take you to a new area. Accepting will transport you to Greymoor, unlocking a major new biome critical for story progression and the path to the true ending.
This quest is essential for unlocking new areas and is a key step in the journey toward 100% completion.
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