Where To Find All Lost Fleas In Hollow Knight: Silksong

TL;DR

  • Lost Fleas quest begins in The Marrow with Fleamaster Mooshka and requires specific movement abilities
  • Rescuing fleas unlocks progressive rewards including Flea Brew for speed boosts
  • Caravan moves to new locations at specific rescue thresholds throughout your journey
  • Many fleas require advanced platforming skills and careful navigation through hazardous areas
  • Complete collection provides significant gameplay benefits and access to hidden content


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Are you searching for every Lost Flea location throughout the expansive world of Hollow Knight: Silksong? These tiny creatures have been dispersed across the deepest reaches of Pharloom’s underground regions. As Hornet, your mission involves tracking down each missing flea to complete this extensive side quest. Our comprehensive guide delivers all essential information, so prepare yourself for an extensive exploration journey.

The Lost Fleas side mission originates from an NPC collective headed by Fleamaster Mooshka. You’ll encounter this group within an area known as The Marrow. Starting from the bottom section, ascend beyond the dangerous spike hazards and moving platforms. You’ll then notice a distinctive flea-themed marker positioned to your left. This campsite additionally features a resting bench where you can recover your health reserves.

Important Note: Our comprehensive Hollow Knight: Silksong Lost Fleas guide systematically categorizes findings by geographical region. We’ve incorporated detailed insets for zones containing solitary critters and provided complete area maps for locations hosting multiple Lost Fleas.

Additional Guidance: Although certain Lost Fleas become accessible during early gameplay phases, numerous others occupy exceptionally challenging positions. We strongly recommend acquiring the essential Clawline Grappling Hook and Faydown Cloak Double Jump capabilities to facilitate navigation through complex environments.

The Lost Fleas objective in Hollow Knight: Silksong functions as a multi-phase undertaking. Each time you accumulate a specific quantity of rescued creatures, consult with Fleamaster Mooshka to determine if you’ve unlocked new rewards.

To illustrate progression mechanics, after successfully rescuing five Lost Fleas, Mooshka announces the caravan’s relocation to unfamiliar territory. You can board the transport for passage directly to the Greymoor district. Upon arrival, an NPC called Grishkin presents you with Flea Brew, an exclusive potion that enhances both mobility velocity and combat speed when utilized. You maintain the option to revisit Grishkin whenever you need to replenish this valuable consumable.

Mooshka consistently encourages continued rescue efforts for additional Lost Fleas encountered during your adventures. Essentially, the Flea Caravan transitions between destinations corresponding to each achievement milestone—specifically, the cumulative number of successful rescues accomplished.

Advanced Platforming Strategy: Many Lost Flea locations demand mastery of Hornet’s movement capabilities. The Clawline Grappling Hook enables crossing wide gaps, while the Faydown Cloak Double Jump provides crucial vertical mobility. Combining these abilities with precise timing is essential for reaching the most challenging flea positions.

Common Collection Mistakes: Many players attempt flea collection without necessary abilities, wasting hours on impossible platforming sections. Always verify you have required tools before attempting difficult rescues.

To acquire this specific Hollow Knight: Silksong Lost Flea specimen, navigate to the summit of the central chamber—specifically, the section positioned rightward from corridors containing the fast travel station and resting bench.

The overhead region saturates with spike hazards and vanishing platforms. However, with careful maneuvering and precise timing, you should successfully reach the upper-right segment where the captive Lost Flea remains imprisoned. Simply strike the restraining vegetation to liberate the creature.

Time Investment Estimates: Completing the full Lost Fleas collection typically requires 3-5 hours of dedicated gameplay, depending on player skill level and prior knowledge of Pharloom’s geography.

Optimization Techniques: Advanced players can streamline collection by planning efficient routes that combine multiple objectives. Group fleas by proximity and tackle clusters during single expeditions to minimize backtracking.

Flea Brew Mechanics Analysis: This potent concoction provides a 15% movement speed increase and 10% attack speed boost for 90 seconds. The effect stacks with other buffs, making it invaluable for challenging boss encounters and time-sensitive platforming sections.

Progressive Unlock System: Beyond the initial Flea Brew reward, continued collection unlocks additional caravan destinations, exclusive vendor items, and special abilities that enhance Hornet’s combat effectiveness throughout the entire game.

Strategic Advantages: Completing the Lost Fleas questline not only provides immediate rewards but also unlocks late-game content and provides significant advantages for completionist players seeking 100% game completion.

  • Execute precise pogo maneuvers on bell-covered adversaries while navigating toward the upper-left section of confined pathways.
  • Gaining entry to the Wormways becomes possible after progressing beyond Shellwood. As an alternative approach, employ a Simple Key at the barrier close to Mosshome. Within the main vertical passage, identify a destructible surface that can be shattered. This reveals a compact room where you’ll observe a flea imprisoned by an aerial insect. Eliminate that opponent to liberate the small creature.

    Your destination is the uppermost area of the Blasted Sands territory. Within the hallway containing the rest spot and quick transit location–specifically right before accessing the Citadel–proceed leftward and ascend the vertical surfaces.

    The Sands of Karak presents some of the most demanding traversal sequences in the whole game. The Hollow Knight: Silksong Lost Flea situated here resides within the central horizontal passage. When examining the overhead structure, you’ll notice an accessible gap but the surrounding surfaces feature dangerous spikes. The strategy involves generating tree limbs to use as platforms, then performing pogo jumps off hostile creatures to access the higher walls.

    Should you aim to save this specific Lost Flea, then you must defeat the Skarrgard miniboss located at the eastern boundary of The Marrow. This enormous ant represents a significantly threatening enemy because his assault patterns reduce not just one but two health units simultaneously.

    After successfully eliminating him, you’ll obtain passage to the Hunter’s March area. Inside the initial vertical room, inspect the northwest sector. Execute pogo maneuvers using the crimson blossoms while evading the hazardous spikes to access this tiny being.

    This particular Lost Flea resides on the eastern side of Sinner’s Road. It’s confined within a containment unit that requires destruction.

    You can examine a layout of The Slab, an incarceration facility situated in the northwest portion of Pharloom. We covered this location concisely in our Faydown Cloak/Double Jump guide.

    To access this region, you may either allow yourself to be captured by a Wardenfly creature in Deep Docks, or you could continue moving westward from the Choral Chamber after arriving at the Citadel. Important: if captured, Hornet will be stripped of her equipment and you must reclaim your possessions.

    You’ll probably explore The Slab if you seek to acquire the Faydown Cloak Double Jump ability. Regarding the Lost Flea, it’s positioned in the central-western segment of this zone. Immediately beyond the prison cells, you’ll spot an accessible doorway. Investigate this area and release the captive being.

    While the Lost Flea located in the Underworks appears conveniently positioned near the Citadel Lift fast travel point, reaching it actually demands taking an extensive detour through treacherous terrain. The initial illusion of accessibility quickly dissipates as you navigate through this challenging zone.

    Your journey will soon lead you into a hazardous corridor featuring molten lava flooring and explosive insect enemies. The optimal strategy involves maintaining momentum by sprinting through this section while carefully evading the volatile creatures that inhabit this dangerous passage.

    When you finally encounter the Lost Flea, prepare for immediate hostile engagement. This particular specimen exhibits clearly telegraphed assault patterns, primarily consisting of linear flight trajectories that skilled players can anticipate. Master the timing of your pogo bounce attacks to land multiple consecutive strikes while avoiding counterattacks.

    Progress through the Memorium area requires persistent upward movement until you discover a chamber containing machinery that generates and directs violet electrical discharges. Beyond this electrified room, a strategically positioned ledge provides access to elevated passageways that continue your ascent.

    This elevated corridor ultimately guides you to the Lost Flea residing in this region, though you’ll encounter an unexpectedly enlarged specimen that presents greater combat challenges. The increased size significantly alters the encounter dynamics compared to standard variants.

    Approach this confrontation with heightened awareness as the creature will initiate aggressive behavior upon detection. Its offensive moves, while predictable in trajectory, deliver substantial damage if they connect. Perfect your pogo maneuver timing to capitalize on the brief vulnerability windows between its assault patterns.

    The rescue procedure for this specific Hollow Knight: Silksong Lost Flea involves considerably more complexity than typical encounters, requiring meticulous execution of multiple steps:

  • First, navigate to the Wisp Thicket sub-zone, accessible through the upper-left exit point from Greymoor. This location sits in relative proximity to the third Lost Flea we previously detailed in our Greymoor coverage within this comprehensive guide.
  • Starting from the Wisp Thicket resting bench, proceed leftward until reaching the central chamber area. This space contains multiple environmental hazards including flame-emitting lantern fixtures, floating balloon obstacles, and a collectible Rosary item.
  • Systematically strike the overhead ceiling sections to reveal concealed pathways. Execute precise platforming sequences until accessing another zone featuring a Craftmetal resource node.
  • Demolish the left-side wall structure and enter the newly revealed passage. This transports you to a previously unreachable section of the Underworks complex. The primary objective involves meticulous navigation across the chamber while evading the rotating spike-block mechanisms. The targeted Lost Flea occupies the distant corner position within this challenging room.
  • The Putrefied Ducts zone remains accessible through the Memorium pathway. An additional approach exists via the Bilewater route, though this passage remains obstructed until you complete the circuit using the Memorium access method.

    Regardless of your chosen entry point, we’ve strategically marked critical locations and points-of-interest on your navigation map to facilitate efficient exploration and objective completion.

    Action Checklist

    • Locate Fleamaster Mooshka in The Marrow to initiate the quest
    • Acquire Clawline Grappling Hook and Faydown Cloak Double Jump
    • Rescue first 5 Lost Fleas to unlock caravan movement to Greymoor
    • Collect Flea Brew from Grishkin and utilize for challenging platforming sections
    • Systematically complete remaining flea rescues using optimized regional routes
    • Practice pogo mechanics in safer areas before attempting spike-lined corridors
    • Stock up on healing items and upgrade your nail before facing Skarrgard
    • Choose the Citadel access route to The Slab unless you’re confident in quick item recovery
    • Time your platforming sequences during enemy spawn cycles for optimal pogo opportunities
    • Mark rescued fleas on your map to track completion progress
    • Navigate through Underworks lava corridor using sprint evasion tactics
    • Ascend Memorium path while avoiding purple lightning machinery
    • Discover hidden Wisp Thicket path by ceiling striking and platforming
    • Evade rotating spiked blocks in final chamber to reach corner-positioned Flea
    • Execute timed pogo attacks against large Flea variant’s linear flight patterns

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