Sometimes, Prospectors will find multiple wandering bosses in a single area (“a rather rare occurrence,” Therrien said), and in those situations, Prospectors kite them until they can stage spectacular fight clubs where the bosses tear each other apart, as you’ll see below.

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Beast Possessed Soul Vs. Abhorrent Beast, by The14thBloodHunter

Beast Possessed Soul Vs. Blood Starved Beast, by The14thBloodHunter

(Skip to 2:25 to get right into duel.)

While all of these bosses are already known, the Tomb Prospectors are still excited to find them in new places. For instance, at the moment nobody has ever found a wandering boss in the “Isz” type Chalice Dungeon, so the Prospectors are trying their best to see if it’s a possible combination. The Prospectors are also trying to find The Celestial Emissary boss as a wanderer. It’s never been observed before, but the Prospectors are convinced it must exist.

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The holy grail, however, is a particular item called “Revered Great One Coldblood,” an object that is listed in the official Bloodborne game guide as something that can only be found in depth 5 root Chalice Dungeons—and yet, nobody has seen it yet. There’s a debate over the true nature of this item in Bloodborne fandom. Some believe that the Revered Great One Coldblood never made it into the actual game, though it may be contained within the files. Maybe the guide is only partially wrong. Others think that perhaps Bloodborne is glitched so that it gives you the wrong item.

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“There is nothing to support its nonexistence, but at the same time very little to support its existence (pics and descriptions within the game guide and official artbook),” Therrien said. “So we prospect in hopes that potentially it may appear someday, and [we will] forever immortalize the lucky hunter who finds it in gaming history.”

Therrien estimates that he’s created at least 200 Chalice Dungeons with the explicit purpose of finding the Revered Great One Coldblood; so far, no luck. Other members are known to Prospect every single day, meaning they’ve likely created thousands of Chalice Dungeons.

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“You never know what you’ll find!” Therrien said.

The Tomb Prospectors can be found on PSN as the community “Bloodborne: The Tomb Prospectors,” and they have a subreddit where they share findings here. A YouTube gallery of Tomb Prospector findings, compiled by Moros Nyx, can be found here. A Google Doc containing Bloodborne Prospector glyphs, also compiled by Moros Nyx, can be found here.

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Update 1/11 7:54 AM: We originally credited the Tomb Prospectors entirely to Fred Riley, but have amended the article to account for the fact that Moros Nyx is largely responsible for the modern Tomb Prospector community.