Fortnite v37.10 Ecosystem Update: What UEFN Creators Need to Know
The Fortnite v37.10 ecosystem update represents one of the most consequential UEFN releases of 2025—not because of a single headline feature, but because it firmly enforces long-communicated technical boundaries while expanding creator tools, content options, and debugging workflows.
Building on the groundwork laid in v37.00, this update introduces hard memory enforcement, new Debug Command menu options, expanded Verse APIs, and a significant drop of weapons, prefabs, galleries, and branded content. For creators maintaining live islands or preparing large-scale experiences, v37.10 is a checkpoint moment that demands attention.
This article breaks down what’s new, why it matters, and how UEFN creators should adapt moving forward.
UEFN Memory Calculation Enforcement Is Now Live
The most impactful change in v37.10 is the enforcement of the 100,000-unit island memory limit.
What Changed in v37.10
As of this update:
- Islands exceeding 100,000 memory units can no longer be published or updated
- Creators must reduce memory usage below the threshold to submit new versions
- Severe outlier islands may be removed to protect player experience
This enforcement follows the v37.00 shift to cook-time memory calculation, which delivers faster and more accurate results while expanding support for additional asset types and Scene Graph usage.
Why Epic Is Enforcing Memory Limits Now
According to Epic, this change is driven directly by creator feedback and platform stability goals:
- Long memory calculation times were slowing iteration
- Inaccurate results made optimization difficult
- High-memory islands caused performance issues on low-end devices
By enforcing limits alongside improved calculation accuracy, Epic is prioritizing predictable performance across the Fortnite ecosystem.
What Creators Should Do Immediately
- Review island memory usage before attempting updates
- Optimize high-cost assets and unused content
- Revisit island layout, prefabs, and Verse logic
- Reference the updated Memory Management documentation for optimization strategies
More tooling improvements are planned, and additional memory-related updates are listed on Epic’s public roadmap.
New Debug Commands Improve Testing Efficiency
Epic continues to expand the Debug Command menu, adding two highly requested tools in v37.10:
- Increase Score – Instantly adds a specified value to a player’s score
- Decrease Score – Instantly subtracts a specified value from a player’s score
These commands significantly reduce setup time when testing score-based mechanics, competitive modes, and progression systems.
Epic has also kept the Fortnite Creator Most Wanted Debug Commands forum thread open, actively gathering community feedback to prioritize future additions.
Hammerhead Choppa Arrives in UEFN
The Hammerhead Choppa from Battle Royale is now available in both UEFN and Creative, offering creators a more dynamic aerial vehicle option.
Notable Features
- Boost capability for rapid traversal
- Extended hover duration
- Allows pilots to swap seats mid-air without immediate descent
- Loudspeaker support for in-flight music
- Optional skydive behavior when exiting in mid-air
The skydive option has also been added to the existing helicopter device, giving creators more flexibility in aerial gameplay design.
New Weapons, Items, Prefabs & Galleries
v37.10 delivers a substantial content refresh across the Content Browser.
New Weapons
- Veiled Precision SMG
- Eradicator Shadow Precision SMG
- Eradicator Hop Rock Fury Assault Rifle
- Eradicator Marksman Wrecker Revolver
New Item
- Precision Air Strike
New Prefabs & Galleries
- Demon’s Domain Wall Gallery
- Demon’s Domain Floor and Stairs Gallery
- Demon’s Domain Roof Gallery
- Demon’s Domain Foundation Gallery
- Demon’s Domain Props Gallery
- Demon’s Domain Nature Gallery
- Demon’s Domain Storage Building
- Demon’s Domain Temple
These additions support darker fantasy environments, combat-focused experiences, and narrative-driven island themes.
Device, Verse API, and Tooling Updates
Device Updates
- New Hiding Prop Gallery option for the Port-a-Potty, allowing a Military mesh swap
Verse API Additions
Supply Drop Spawner
- DestroySpawnedDrops()
- DestroyCrateEvent
Disguise Device
- RemoveANYDisguise
- ApplyANYDisguiseEvent / BreakANYDisguiseEvent / RemoveANYDisguiseEvent
- IsANYDisguiseApplied
Carryable Spawner
- AgentCollideEvent
These additions give creators finer control over gameplay state, event handling, and dynamic interactions.
Brand Island Updates: LEGO® & Squid Game
LEGO® Islands
- New audio cue for LEGO Gold Stud collectibles
- Questing language and Barrier device options updated
- NPC facial expressions now correctly reflect behavior state
Squid Game Islands
- Added Squid Game-specific participant characters to Disguise device
- Randomized jumpsuit numbers for participants and NPCs
- Added The Front Man as:
- NPC
- Guard cosmetic
- Disguise device option
- Disguise kit
A known collision issue exists for the Cuddle Team Leader asset, with documented workarounds provided in the release notes.
Ecosystem, Editor, and Stability Fixes
v37.10 includes an extensive list of fixes across weapons, consumables, devices, editor tools, UI systems, environments, animation, revision control, and performance.
Highlights include:
- Dynamic Team Emotes stability improvements
- Weapon behavior fixes across multiple legacy items
- Editor crash prevention and labeling improvements
- Sequencer Time Warp Track support
- Major Unreal Revision Control performance and reliability upgrades
These changes collectively improve long-session stability and collaborative workflows.
Epic MegaGrants Reminder for UEFN Creators
Epic is accepting Epic MegaGrant applications for bold UEFN projects through September 22 at 11:59 PM ET.
Creators with ambitious, technically innovative ideas are encouraged to apply for funding and support.
Final Thoughts
Fortnite v37.10 is a defining update for UEFN creators. With memory limits now enforced, optimization is no longer optional—it’s foundational. At the same time, expanded debug commands, Verse APIs, content additions, and brand integrations ensure creators have the tools needed to build deeper, more reliable experiences.
Creators who adapt early by optimizing memory usage, leveraging new debugging tools, and embracing updated workflows will be best positioned as UEFN continues to scale toward more advanced creator economy features later in 2025.