Ever since Diablo 4's release one mystery has loomed larger than all others: Where is the cow level? Despite producer Rod Fergusson quickly pouring cold water on the idea, the history here means that a group of dedicated players has devoted themselves to finding a level that officially doesn't exist, and they've certainly found a few breadcrumbs along the way.
To briefly recap that history, there is no cow level in 1997's Diablo, but rumors of one became so pervasive that Blizzard North would later include a cow level in Diablo 2, one eventually appeared in Diablo 3, and the cows even had a nod in World of Warcraft. Heck, it's significant enough to have its own Wikipedia entry.
Every so often the cow hunters, centered around the Not Finding a Cow Level Discord channel, make small breakthroughs or at least think they have. There was great excitement when a player killed 666 cows last November and a previously unobtainable Musty Tome dropped.
The latest development (as spotted by WoWhead) is the discovery of new relics related to Diablo 3 in the Vessel of Hatred expansion, eventually leading to an item called the Rusted Bardiche. Again it's the Now Finding a Cow Level crew that are doing their very best to not find a cow level, in this case finding three Scrolls of Uacax in the Kurast Docks, Samuk, and Kichuk. Each item's description contains hints about the history of Lord Uacax, with the final reveal being that the name Uacax itself may be a rough translation, meaning «Lord Cow» in Yucatec Maya.
From here, players have to jump through various hoops involving jabbering gemstones, and defeat the Elite Blood Lightning in The Great Shelf with reference to one of the above scrolls. It says Uacax defeated the monster «untrained in combat», and so the trick is to reset all of your character's skills and abilities, dismiss any mercenaries, and then beat the thing with your basic level 1 attack.
After obtaining this relic, the next relates to the scroll linking birdsong
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