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Unless stated otherwise, everything here is Diablo II: Resurrected build 3.3.93847, Reign of the Warlock.

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ForumBuilds, farming, trading and the Warlock — open to read, free to join.
LoaderMythosLoader: run several game clients on one PC. Download, pictures and how to use it.
LadderEvery D2R ladder in every region, refreshed every 30 minutes: histories, level-ups, deaths, tracking.
TrackersLive trackers: the current and next Terror Zone, read in game by our own servers, Diablo Clone progress on every realm, and Battle.net's region status.
Terror ZonesThe Terror Zone up now, read in game by our own servers, with a countdown, monster levels for your character, immunities and a watch list.
Diablo CloneUber Diablo progress on every realm, with change history.
DatabaseThe D2R game database from the game's own files: uniques, sets, base items, runewords, cube recipes, runes, gems, affixes and more.
RunewordsAll 99 runewords from the 3.3.93847 tables, rendered like the tooltip.
Cube Recipes157 working Horadric Cube recipes (plus 70 disabled rows), resolved from the game's own code columns.
MechanicsHow the game works, one stat at a time: what it does and every item, runeword, affix and skill that gives it.
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Blizz TrackerEvery Blizzard community manager and news post on the official D2R forum, word for word — with alerts when a new one lands.
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ToolsDPS, experience, drop and cube calculators on the verified tables.
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Build 3.3.93847

Uniques, sets, runewords, base items,
runes, monsters, areas, the forum.

Try “shako”, “enigma”, “baal” or “the pit”.

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All quest bases

Book of Skill Burning Essence of Terror

Quest · Base item

Bul-Kathos' Nightmare

Reign of the WarlockDoes not drop

Bul-Kathos' Nightmare

Bul-Kathos' Nightmare

Details

Item level: 0
Required level: 0
Inventory size: 1 × 2
Counts as: Quest
Vendor price: 20,000 gold
Item code: ua4

In the tools

Where it dropsDrop Explorer: the best monsters for it
Put it in the cubeCube Validator: the recipes it can start

In the Horadric Cube

1 recipe take or make it

takesTalic's Anguish + Korlic's Pain + Madawc's Ire + Bul-Kathos' Nightmare + Worusk's End → Red Portal — item level 137, ×1

Source: misc.txt row “ua4” of build 3.3.93847; sockets by item level from itemtypes.txt; automatic mods from automagic.txt, superior mods from qualityitems.txt, potion rows from belts.txt, vendors from the vendor columns. · Report incorrect data