Diablo series has always been built upon a deep and captivating lore, one that the developers have steadily expanded from Diablo I all the way through Diablo IV. And when a story grows rich enough, it inevitably invites hidden layers - secrets woven into its fabric for the keen-eyed to uncover.
Players have already unearthed plenty of mysteries within Lord of Hatred expansion, including the ever-elusive Secret Cow Level. Yet according to the development team, at least one major secret still lies completely undiscovered, and the player base hasn't even come close to it.
That proclamation is bound to pique the curiosity of any dedicated explorer. One can only speculate on what that secret might be, then follow the breadcrumbs wherever they lead.

Cow God
For starters, Secret Cow Level is not the end of the bovine-related thread. After defeating Cow King, players can obtain a quest item called Prime Rib. Unlike most such items, Prime Rib can be stacked and will drop from Cow King multiple times.
Its flavour text remarks that this cut is worthy of being offered to anyone - even a deity. If that line carries any weight beyond humour, it suggests that Prime Rib might actually be a sacrificial offering to some divine being.
One possibility is that it points to another god hidden somewhere within Sanctuary. In Diablo IV, the only strange NPC with whom players have directly interacted is the enigmatic fishing merchant, Shi Yugong. His tone and mannerisms bear a striking resemblance to Covetous Shen from Diablo III - even sharing the same voice actor. Should that connection hold true, then Shi Yugong would be the sole divine figure players have ever encountered.
Even more intriguing is the world map itself, which depicts two colossal creatures: one resembling a leviathan fish, and another a sea monster sporting horns and multiple hooves of varying sizes. Moreover, developers have been spotted wearing T-shirts bearing these very motifs during their live streams. Unless they are deliberately misleading the audience, those designs likely carry some significance.
Still, the more probable explanation is that the studio does intend to continue this storyline, but simply has not yet implemented that content. Despite the many hints, players have already exhaustively scoured Secret Cow Level. If the secret truly exists, they are probably very close to revealing it, even if they have not quite managed it yet.
Zoltun Kulle
Another line of speculation ties into a much larger enigma within Diablo IV. For years, the community has accepted that Zoltun Kulle met his end at the hands of Nephalem during Act II of Diablo III. However, hidden within lore manuscripts obtained through Artificer's Stash, a startling revelation surfaces: Zoltun Kulle is in fact the creator of both The Pit and Tower. In other words, he never truly died.
This discovery grows all the more bizarre when players delve into the hidden quest chain surrounding Chorons within The Pit. Scattered across various tiers of The Pit, one can find writings left by Chorons, an ancient Horadrim who once pursued Zoltun Kulle. After failing in that hunt, he somehow became trapped within The Pit, enduring countless ages. His tragic tale culminates in Chorons himself appearing as a hidden boss within those depths.
If Zoltun Kulle indeed fashioned The Pit and Tower, then could the final undiscovered secret involve tracking him down directly? He might be lurking somewhere out of sight, yet players may simply be searching from the wrong angle.
Luckiest Coin
Diablo IV already contains a covert quest line that spans both the base game and the Vessel of Hatred expansion, and it revolves around a lucky coin. In the main campaign, players can initiate a quest to find a Lucky Coin.
During a certain NPC event, if a player loots a fallen enemy while under the effect of a Greed Shrine, that drop will yield a Lucky Coin. Taking that coin to a wishing well east of Cerrigar then rewards the player with Well-Wisher title.
Yet that is not the end. When five players, each using a different class, offer their coins together at the well, a hidden unique ring - Ring of Misfortune - materialises.
Later, in Vessel of Hatred, players discovered Luckier Coin. The process involves heading to the Nahantu region and destroying highlighted containers while under a Blast Wave Shrine. Doing so summons an invincible rat.
One must follow that rat for exactly seven minutes and nine seconds until it randomly explodes, dropping Luckier Coin. Taking this coin to a moss-covered tomb in the town of Samuk, within Nahantu, yields another hidden unique ring: Ring of the Jinx.
The base game has one coin quest line, and Vessel of Hatred has a second. By that logic, Lord of Hatred ought to contain a third, which would guide players toward obtaining Luckiest Coin.
Indeed, data miners have already uncovered Luckiest Coin in the game files, though no one has yet found how to acquire it in practice. Most likely, it will be found in Skovos Isles, and its acquisition will involve some shrine-related mechanic.
Given that both the wishing well in the base game and the tomb in Vessel of Hatred bear inscriptions, players should keep an eye out for any strange, interactive areas that seem out of place.
Those are the leading theories regarding the hidden secrets of Lord of Hatred expansion. Luckiest Coin very well could be the major secret the developers alluded to. Players already know it lies just behind the wall - they simply have not yet found the door.







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