Claim the Free 'Lost Explorers' Swords Pack' DLC Before It Expires (Plus Early Impressions)

The launch window of any multiplayer horror game is always a chaotic mix of terrifying highs and frustrating technical lows, and The Mound: Omen of Cthulhu is no exception. While thousands of players are currently descending into the abyssal depths of K'n-yan to lose their minds, there is a very important piece of housekeeping you need to take care of right now.

The game’s very first DLC, the Lost Explorers' Swords Pack, is currently available completely for free. But the clock is ticking, and you only have a few days left to secure it.

In this piece, we are going to break down everything you need to know about this time-sensitive drop, how to get it, and what early adopters are saying about the state of the game. Spoiler alert: the psychological horror is carrying the experience hard, even if the frame rates occasionally decide to tank.

How to Claim the Lost Explorers' Swords Pack

According to a heavily upvoted thread on the FreeGameSquad subreddit, the Lost Explorers' Swords Pack is currently sitting at a 100% discount on Steam. This offer expires on July 29, 2026.

What exactly is in this pack? Based on the title and the game's heavy reliance on Lovecraftian history, this DLC provides early-game melee options that serve as relics from previous, doomed expeditions. Think about the historical context we discussed in our Lovecraft novella lore breakdown. These aren't modern tactical knives; these are likely ornate Spanish conquistador rapiers, heavy Victorian machetes, and antique cavalry sabers.

In a game where ammunition is desperately scarce, having a reliable melee weapon from the jump is a significant advantage. A heavy sword can mean the difference between staggering an encroaching horror or getting pinned down in the dark.

However, there is a catch inherent to Steam's promotional infrastructure. You cannot simply claim the DLC to an empty library; you must own the base game to add the DLC to your account. If you were on the fence about picking up the game at launch and were waiting for a few patches, you might want to reconsider your timeline just to secure this pack. If you're wondering which version makes the most sense for your budget, take a quick look at our editions and preorder guide.

Early Community Reviews: The Good, The Bad, and The Eldritch

So, you bite the bullet, buy the base game, claim your free swords, and boot up a lobby with your friends. What should you actually expect from the current build?

Over on various gaming subreddits, early reviews and player impressions are starting to paint a very clear picture. The general consensus is that The Mound: Omen of Cthulhu is a wildly atmospheric, genuinely terrifying experience that is currently fighting a localized war against its own technical limitations.

The Brilliance of the Sanity System

Let's start with the positives, because they are substantial enough to justify the price of entry. The survival horror market is undeniably saturated. Standing out requires more than just a spooky monster chasing you down a dark hallway with a flashlight.

Players are universally praising the environment design and the game's unique approach to mental degradation. We previously theorized about the mechanics in our sanity system explanation, and community reports confirm that it is the crown jewel of the experience.

It isn't just a basic meter that ticks down and eventually causes a game over. It dynamically and individually alters your perception of the environment.

Imagine this scenario: you are navigating a narrow, precarious ledge over a seemingly bottomless abyss. Player A, whose sanity is relatively intact, sees a sturdy, albeit ancient, stone bridge. Player B, whose sanity is heavily drained from a previous encounter, sees the bridge crumbling, covered in pulsating, meaty tendrils, and hears the whispers of unseen entities below. Player B refuses to cross, hyperventilating over voice comms, while Player A desperately tries to convince them that the path is safe. Then, Player B spots a creature lunging from the shadows—a creature that Player A literally cannot see.

This asymmetry creates incredible tension. When your buddy screams about a monster, do you trust them and waste precious ammo shooting at empty air, or do you assume the cavern is just playing tricks on their mind? It forces a level of communication, mistrust, and shared panic that elevates the standard co-op dynamic. It is exactly the kind of psychological terror you want from a Lovecraft adaptation, proving that the developers truly understand the source material.

Breathtaking Environments

The environments themselves are also receiving massive praise. Transitioning from the mundane, cramped caves of the surface world into the cyclopean, impossible architecture of the underground cities is apparently breathtaking. It's not just a series of dark tunnels; it's a descent into alien ruins that make you feel appropriately small and insignificant. If you want to know what kind of nightmares inhabit these ruins, take a look at our confirmed creatures preview.

The Elephant in the Room: Performance and Combat Issues

However, it is not all smooth sailing in K'n-yan. The exact same highly-upvoted reviews that praise the atmosphere are quick to point out significant performance and combat issues in the current build.

Performance-wise, players are reporting frame rate stutters, particularly when transitioning between large underground biomes or during intense encounters when multiple entities spawn at once. Given the lighting engine, the dense volumetric fog, and the complex visual effects tied to the individual sanity hallucinations, it is not entirely surprising that the game is demanding. If you haven't yet, you should verify your rig against the expected system requirements. You may need to dial back the shadow quality and rely heavily on upscaling tech until the developers roll out targeted optimization patches.

Then there is the combat. Early adopters are describing the melee and shooting mechanics as noticeably clunky. Hit registration seems to be a very common complaint. When you are swinging one of those brand-new swords from the Lost Explorers' Pack, you need to know it's actually connecting with the horrors lunging at you.

In a game where survival hinges on desperate, stamina-draining defenses, unreliable combat can lead to frustrating, unearned team wipes. When a subterranean hybrid lunges, you need your parry or dodge input to register immediately. If the input lags or the hitbox is misaligned, you take a massive hit. That hit lowers your health, which in turn accelerates your sanity drain, pushing you into a vicious cycle of failure caused by technical flaws rather than poor strategy.

It is worth noting that some amount of "clunk" is historically acceptable in survival horror. You aren't supposed to feel like a nimble action hero; you're supposed to feel like a vulnerable investigator way out of their depth. But there is a fine line between intentional vulnerability and mechanical unresponsiveness, and the developers will need to tighten up the hitboxes quickly.

Where Does It Sit in the Co-op Landscape?

Despite these rough edges, the general community sentiment is surprisingly forgiving. The Mound: Omen of Cthulhu is doing enough things right to justify its existence in a genre dominated by established heavyweights. When we compared it to the competition in our GTFO, Lethal Company, and Darktide breakdown, we hoped it would carve out its own distinct niche. Based on these early hours, it successfully has.

The deep psychological horror elements and the sheer, oppressive scale of the environments provide a very different flavor than the frantic scrap-collecting of Lethal Company or the hyper-tactical, rhythm-based shooting of GTFO. It is slower, more methodical, and arguably much scarier. If you are playing with a dedicated group of friends (and if you are wondering how the matchmaking works, check our co-op, crossplay, and solo guide), the current technical hiccups are absolutely worth enduring for the sake of the unique scares.

Looking Ahead

For now, the priority for any new or prospective player should be securing that free DLC. Navigate to the Steam page, make sure the base game is in your library (which you can read more about regarding pricing in our release date and price tracker), and add the Lost Explorers' Swords Pack to your account before July 29th.

Even if you encounter some frame drops or get frustrated by a missed melee swing during your first descent, at least you'll look like a seasoned veteran of the 1920s occult underground while doing it.

We will be keeping a very close eye on the developer's patching schedule over the next few weeks. If they can iron out the performance issues and tweak the combat responsiveness without compromising the incredible atmosphere they've built, this game is positioned to be one of the standout horror releases of the year. Stay tuned for our full beginner's guide once we've spent a bit more time losing our minds in the dark.