Legendary Materials

Freshly-dropped legendary material.

Legendary materials are found in Reaper of Souls (a few are also found also in Diablo 3 version 2), and required for all legendary and set crafting. While all the regular materials are created by salvaging items, all legendary materials except for Fiery Brimstones and Forgotten Souls must be found in the world. They can be difficult to obtain; almost all legendary materials drop only from certain purple Unique bosses, and these are largely random in their location and frequency.

Like normal types of Materials, Legendary Materials have no function on their own, and are used exclusively in the crafting of set and legendary items. Players generally find a legendary crafting plan, teach it to the Blacksmith, and then view the details of that armor or weapon before deciding if it's worth trying to find the legendary material required to make it. That's what this article is for, with info on every legendary crafting materials, the legendary/set plan they are tied to, and the name and location of the Unique bosses capable of dropping them.

Legendary Material Drop Rates

Legendary materials drop more often on higher difficulty levels. Their drop rate was tripled in Patch 2.0.4 shortly after Reaper of Souls' release, making them all much easier to find. The figures are the percent chance the legendary material (or Deaths Breath will be dropped by a valid source. All legendary materials except Adventurer's Journals and Griswold's Scribblings can only be dropped by Unique (purple) bosses of a certain type. See the legendary materials article for full details.

Legendary Material and Deaths Breath drop rates

Normal: 15%
Hard: 18%
Expert: 21%
Master: 25%

Torment 1: 31%
Torment 2: 37%
Torment 3: 44%

Torment 4: 53%
Torment 5: 64%
Torment 6: 77%

The same drop rates apply to Death's Breaths, though they have many more possible drop sources.

Legendary Materials

The following 41 legendary materials are required for crafting various legendary and set items. The Adventure's Journal and Griswold's Scribblings can drop from various objects from level 10-70, and both are present in Diablo 3. All the rest are Reaper of Souls only, and only drop from level 70 Uniques (Purples) of the correct type.

This table is meant for quick reference. Refer to the individual legendary material articles for more details on the crafting purposes, scarcity, farming tips, and more.

Legend:

Bounty: Monster may appear as a Bounty target.
Fixed: Monster appears in this location every game (may differ between Story Mode and Adventure Mode).
Event: Monster is part of an event. (Most events are random spawns and not found every game.)
Legendary Affixes: Special bonus properties only granted by legendary items. (Can not be enchanted.)
Item Set: Bonuses for equipping more than one item from this item set.
Inherent Affixes: Affixes always found on that item. (May be enchanted.)

Monsters listed are confirmed to drop the materials. Others may drop but are not yet confirmed. Feedback in the forum thread is welcomed.

Item	Used For	Drops From
Adventurer's Journal	Pender's Purchase (Crafted Legendary gloves) Legendary Affixes: None. +6 Random Affixes	Breakable and clickable objects (except chests). Seen from loose floor tiles, urns and vases, barrels, dead bodies, etc.
Angelic Shard	Hallowed Protectors Item Set bonus: (2): +100 All Resistance (2): +10% Attack Speed	Corrupted Angels, found entirely in Acts Four and Five Bounty -- Pyres the Damned Act 4, The Silver Spire Level 1. Fixed, Bounty -- Izual, Act 4, The Great Span. Haziael, Act 5, Battlefields of Eternity. Event -- Erelus, Act 5, Battlefields of Eternity. The Crag of Eternity, spawns with "The War That Time Forgot" event. Celik, Act 5, Pandemonium Fortress Level 2.
Behistun Rune	Mark of the Magi (Crafted Legendary staff) Legendary Affix: None Inherent Affix: (1177-1439)-(1410-1788) Arcane Damage +5 Random Affixes	Unique Cultist Summoners and their Unique Hellions (Demon Dogs). Urik the Seer, Act 1, Fields of Misery, Khazra Den. (Fixed spawn in Story Mode.) Cadhul the Deathcaller. Act 1, Southern Highlands. Bounty -- Jezeb the Conjuror, Act 1, Leoric's Manor. Bounty -- Krailen the Wicked, Act 1, Leoric's Manor. Bounty -- Yeth, Act 2, Road to Alcarnus. Bounty -- Shondar the Invoker, Act 2, Alcarnus. Pontius, Act 5, Westmarch Commons.
Bloody Pincer	Demon Claw Monk (Crafted Legendary Fist) Legendary Affixes: None Inherent Affix: +(981-1199)-(1175-1490) Fire Damage +5 Random Affixes	Tormented Stingers and Scarabs. Bounty -- Severclaw, Act 3, Arreat Crater Level 1. Bounty -- Crabbs, Act 3, Tower of the Damned Level 2. (Bounty.) Bounty -- Scorpitox, Act 3, The Core of Arreat. Balata, Act 5, Ruins of Corvus. Vosk, Act 5, Passage to Corvus. (Common. Spawns during "The Hatchery" event.) Scarnax, Act 5, Ruins of Corvus.
Born's Key	Born's Command Item Set bonus: (2) Set: +15% Life (3) Set: Reduces cooldown 10% (3) Set: Increased EXP: 20%	Brigands (grave robbers). Bounty -- Lucious the Depraved, Act 1, Cemetery of the Forsaken. Bounty -- Dataminer, Act 1, Defiled Crypt, dungeon below the Cemetery of the Forsaken. (Bounty.) Bounty -- Digger O'Dell, Act 1, Defiled Crypt, dungeon below the Cemetery of the Forsaken. Bounty -- John Gorham Coffin, Act 1, Defiled Crypt, dungeon below the Cemetery of the Forsaken.
Captured Nightmare	Night's Reaping Barb (Crafted Legendary 1H Mighty Weapon) Legendary Affix: None Inherent Affixes: +(981-1199)-(1175-1490) Cold Damage +14-18% Life +4 Random Affixes	Terror Demons and Enslaved Nightmares. Haures, Act 4, The Silver Spire Level 2. Bounty -- Grimnight the Soulless, Act 4, The Silver Spire Level 2.
Captured Soul	Lai Yui's Persuader Monk (Crafted Legendary Daibo) Legendary Affix: None Inherent Affix: +(1177-1439)-(1410-1788) Cold Damage +5 Random Affixes	Soul Rippers. (Tongue Lashers.) Aloysius the Ghastly, Act 3, The Keep Depths Level 2. Bounty -- Riplash, Act 3, Tower of the Damned Level 2.
Cartographer's Toolkit	Board Walkers Crafted Legendary boots Legendary Affix: None Inherent Affix: +10-12% Movement Speed + 5 random affixes	Ghouls. (The fast moving melee type.) Bounty -- Grimsmack, Act 1, Festering Woods. Bounty -- Enkidu. Act 1, Festering Woods. Spawns as part of the Eternal War event. Bounty -- Lavarinth, Act 3, Rakkis Crossing. Spawns as part of the Blaze of Glory event. Gholash, Act 3, Tower of the Damned Level 1.
Cultist Blood	Blood-Magic Edge (Crafted Legendary Dagger) Legendary Affix: Blood oozes from you. Inherent Affix: +5-7 Attack Speed +5 Random Affixes	Cultists. (Melee attacker type.) Bounty -- Percepeus, Act 1, Leoric's Hunting Grounds. Bounty -- Brakan, Act 1, Highlands Cave, dungeon below Leoric's Hunting Grounds. Spawns during The Apothecary's Brother event. Sarella the Vile, Act 1, Leoric's Manor Courtyard. Fixed -- Cultist Grand Inquisitor, Act 1, Halls of Agony Level 1. On that level every game in Story Mode or Adventure Mode. Bounty -- High Cultist Murdos, Act 2, Alcarnus. Bounty -- Jhorum the Cleric, Act 2, Alcarnus. Bounty -- Inquisitor Hamath, Act 2, Alcarnus.
Defiled Doll	Spite WD (Crafted Legendary Mojo) Legendary Affix: None Inherent Affixes: +262-328)-(364-394) Damage +8-10% Critical hit Chance +4 random affixes	Succubi. Bounty -- Demonika the Wicked, Act 3, Tower of the Damned Level 1. Bounty -- Kysindra the Wretched, Act 4, The Silver Spire Level 1. Bounty -- Lady Victoria, Act 5, House of Deep Sorrow, dungeon from Westmarch Commons.
Demon Skin	Demon's Hide Item Set bonuses: (2): 6000 Thorns damage per hit (3): +25% Area Damage (4): +15% damage to demons, (4): Chance to deflect projectiles	Phasebeasts and Armored Destroyers. Axgore the Cleaver, Act 3, The Core of Arreat. Haxxor, Act 3, Tower of the Damned Level 1. Bounty -- Grimmaw, Act 3, Tower of the Damned Level 2. Bounty -- Khatun, Act 4, Gardens of Hope 1st Tier. Fixed -- Razorclaw, Act 4, Gardens of Hope 2nd Tier. (Fixed spawn in Story mode, as part of the Corrupt Growths Tier I sub-quest of The Light of Hope main quest.
Element of Celerity	Fleeting Strap (Crafted Legendary Belt) Legendary Affix: None Inherent Affix: +5-7% Attack Speed +5 random affixes	Scavengers. Bounty -- Mange, Act 1, Weeping Hollow. Bounty -- Burrow Bile, Act 1, Fields of Misery, Forlorn Farm event. Dreadclaw the Leaper, Act 1, Fields of Misery. Bounty -- Shanabi, Act 1, Lost Mine Level 2, dungeon below the Fields of Misery. {Spawns during The Precious Ores event.) Bounty -- Armorer's Bane, Act 1, Watch Tower, dungeon below the Southern Highlands. (Spawns during the Scavenged Scabbard event.)
Essence of the Twin Seas	Captain Crimson's Trimmings Item Set bonuses: (2): +2000 Life Regen (2): 10% Cooldown Reduction (3): +50 All Resistance (3): Reduces resource costs 10%	Dune Threshers. Bounty -- Razormouth, Act 2, Black Canyon Mines. Monstrous Dune Thresher, Act 2, Stinging Winds. (Giant-sized, emerges from quicksand.) Moontooth Dreadshark, Act 2, Sewers of Caldeum. (Random spawn, emerges from rubble that spawns in a north-eastern dead end corridor.)
Eternal Power Capsule	Arcane Barb (Crafted Legendary 2H Xbow) Legendary Affix: None Inherent Affix: +(981-1199)-(1175-1490) Arcane Damage +5 Random Affixes	Cuddle Bears. Evil Oliver, Act 1, Whimsyshire.
Eyes of the Dead	War of the Dead Barb (Crafted Legendary 2H Mighty Weapon) Legendary Affix: None Inherent Affix: +(1177-1439)-(1410-1788) Damage +5 Random Affixes	Skeletons. (Melee type.) Fixed -- Headcleaver, Act 1, Leoric's Passage. Fixed spawn in Campaign Mode, during the Explore Cellar sub-quest of The Legacy of Cain quest. Bounty -- Merrium Skullthorn, Act 1, Cathedral Level 2.
Frozen Blood	Utar's Roar (Crafted Legendary 1H Axe) Legendary Affix: None Inherent Affixes: +(981-1199)-(1175-1490) Cold Damage Cold skills deal 15-20% more damage +4 random affixes	Chiltara, Act 3, Caverns of Frost level 2, below Fields of Slaughter.
Glowing Ore	Cosmic Strand Wiz (Crafted Legendary Source) Legendary affix: Teleport gains the effect of the Wormhole rune. Inherent affix: +(262-328)-(263-394) Damage +5 Random Affixes	Primordial Scavengers. (Rock-armored giants > soft interior creatures.) Sartor. Act 5, Battlefields of Eternity. Magrethar, Act 5, Realm of the Banished area off of the Battlefields of Eternity. Event -- Soul Scavenger, Act 5, Pandemonium Fortress Level 1. (Spawns during the Demon Souls event.)
Griswold's Scribblings	Griswold's Perfection (Crafted Legendary 1H Sword) Legendary Affix: None Inherent Affix: +(981-1199)-(1175-1490) Fire Damage +5 Random Affixes	Bookshelves, lore bags, Cain's backpacks, satchels, podiums, Angiris Archives, etc. (Can be found in thousands of places, but hard to farm intentionally.)
Hilt of the Silver Wolf	Golden Scourge Crus (Crafted Legendary 1H Flail) Legendary Affix: Smite jumps to 3 additional enemies. Inherent Affixes: +(981-1199)-(1175-1490) Holy Damage Holy skills deal 15-20% more damage +4 Random Affixes	Fallen Hounds. Grownfang, Act 3, Skycrown Battlements. Bounty -- Growlfang, Act 3, Arreat Crater Level 1. Gnawbone, Act 3, Tower of the Damned Level 1.
Human Cartilage	Wall of Man (Crafted Legendary Shield) Legendary affix: +20-30% chance to be protected by a wall of bones. Inherent affixes: None	Unburied. Bounty -- Kankerrot, Act 1, Weeping Hollow. Fixed -- Manglemaw, Act 1, Defiled Crypt level 2, below the Cemetery of the Forsaken. (Fixed spawn on quest in story mode. Cudglearm, Act 1, Cathedral Level 2. Event -- Tormented Behemoth, Act 1, Halls of Agony Level 2. (Spawns during the A Stranger in Need event.}
Iron Wolves Doctrine	Asheara's Vestments Item Set bonuses: (2): +100 All Resistance (3): +20% Life (4): Attacks cause your followers to occasionally come to your aid.	Deceiver Magi. (The nova-field casting snake men.) Ningish, Act 2, Sewers of Caldeum. Gryssian, Act 2, Dahlgur Oasis. Fixed -- Ssthrass, Act 2, Dahlgur Oasis. (Guarding the entrance to the Ancient Waterway.)
Living Flame	Cinder Switch (Two-handed Axe) Legendary Affix: 25-50% to cast a Fireball when attacking Inherent Affix: +(1177-1439)-(1410-1788) Damage +4 Random Affixes.	Morlu Casters. (The Meteor-dropping type.) Malfeas the Abhorrent, Act 4, Gardens of Hope 2nd Tier, Radiant Chapel. Bounty -- Sao'Thall, Act 4, The Silver Spire Level 2. Bounty -- Rhau'Kye, Act 4, The Silver Spire Level 2.
Lyekurn's Diary	Corruption (Crafted Legendary Shoulders) Legendary Affix: None Inherent Affix: None	Fixed -- Azmodan. (Act Boss of Act Three.)
Maghda's Tormented Soul	Cain's Destiny Item Set bonuses: (2): +8% Attack Speed (3): +50% Magic Find (3): +50% Increased Experience	Fixed -- Maghda. End dungeon in Alcarnus, Act 2. Often a bounty also.
Mystical Source	Sage's Journey Set Item Set bonuses: (2): +250 Str/Dex/Int/Vit (3): Doubles Death's Breath drops.	Ponies. Creampuff, Act 1, Whimsyshire. Midnight Sparkle, Act 1, Whimsyshire. Nightmarity, Act 1, Whimsyshire. Members of Team Unicorn: Miss Hell, R'Lyeh, Killaire and Maulin Sorely.
Phial of Weakness	Atrophy Wiz (Crafted Legendary Wand) Legendary Affixes: None Inherent Affixes: +(981-1199)-(1175-1490) Fire Damage +5 Random Affixes	Heralds of Pestilence. Deadgrasp, Act 3, The Battlefields. Event -- Handible, Act 3, The Battlefields. Bounty -- Valifahr the Noxious, Act 3, Arreat Crater Level 1.
Quaking Vial	Sunder (Crafted Legendary 2H Mace) Legendary Affix: 25-50% chance to sunder the ground beneath your enemies Inherent Affixes: +(1177-1439)-(1410-1788) Fire Damage +4 Random Affixes	Mallet Lords. (Hammer time!) Bounty -- Aspect of Destruction, Gardens of Hope 1st tier. Bounty -- Sledge, Act 4, Hell Rift. Bounty -- Hammersmash, Act 4, Hell Rift.
Reaper's Fear	Reaper's Wraps (Crafted Legendary Bracers) Legendary affix: Health globes restore 25-30% of your primary resource Inherent affixes: None +5 random affixes	Fixed -- Malthael. Act Boss for Act 5. (Also the only source to drop the Reaper's Wraps plan itself.)
Rydraelm Tome	Mantle of the Rydraelm (Crafted Legendary chest armor) Legendary affix: None Inherent affixes: None	Fallen Shamans. Beyatt, Act 2, The Lost Caravan dungeon below the Stinging Winds. Ashangu, Act 2, Dahlgur Oasis. Bounty -- Bashiok, Act 2, Dahlgur Oasis. (Random spawn.) Mundungo, Act 2, Dahlgur Oasis. Always near the center of the large waterwheel area, when it spawns.
Shard of Entsteig Plate	Aughild's Authority Item Set bonuses: (2): -7% damage from ranged attacks. (2): -7% damage from melee attacks. (3): +15% damage against Elites (3): -15% damage from Elites	Enraged Phantoms. (Flying Wraith ghosts.) Bounty -- Lord Dunhyld, Act 1, Defiled Crypt, dungeon below the Cemetery of the Forsaken. End target of The Matriarch's Bones event. Bounty -- Feklar's Ghost, Act 1, Festering Woods. Bounty -- Hawthorne Gable, Festering Woods. Raziel, Act 2, Sewers of Caldeum. Shade of Nar Gulle, Act 2, Sewers of Caldeum. Bounty -- Spirit of Khan Dakab, Act 2, Tomb of Khan Dakab dungeon below the Dahlgur Oasis. Bounty -- The Archivist, Act 2, Archives of Zoltun Kulle, The Unknown Depths. Bounty -- The Tomekeeper, Act 2, Archives of Zoltun Kulle, Realm of Shadow.
Shattered Core	Devastator (Crafted Legendary 1H Mace) Legendary affixes: None. Inherent affixes: +(981-1199)-(1175-1490) Fire Damage +15-20% damage to Fire Skills	Sand Dwellers. (Huge Sand Golems who wait hidden beneath the surface.) Fixed -- Ancient Guardian, Act 2, The Forgotten Ruins dungeon below the Dahlgur Oasis. (Fixed spawn in Campaign Mode, during The Forgotten Ruins sub-quest of the Betrayer of the Horadrim quest. Bounty -- Rockgut, Act 2, The Unknown Depths dungeon below the Archives of Zoltun Kulle. Bounty -- Thrum, Act 2, Realm of Shadow, dungeon below the Archives of Zoltun Kulle.
Shimmering Quill	Unbound Bolt (Crafted Legendary Bow) Legendary affixes: None Inherent affixes: +(981-1199)-(1175-1490) Fire Damage +5-7% Attack Speed +31-35% Critical hit Damage +3 Random affixes.	Quill Fiends. Sarkoth, Act 1, Dank Cellar below Old Tristram Road. Gorathra, Act 1, Musty Cellar below Old Tristram Road. Thornback, Act 3. The Keep Depths Level 1.
Shuddering Demon Bone	Archfiend Arrows DH (Crafted Legendary quiver) Legendary affix: None Inherent affixes: +15-20% Attack Speed +8-10% Critical hit Damage +5-8% Damage to Elites	Morlu. (Melee type, wielder of Diabos.) Bounty -- Kao'Ahn, Act 4, Gardens of Hope 2nd Tier. Bounty -- Oah'Tash, Act 4, Gardens of Hope 2nd Tier.
Skelon's Dice	Skelon's Deceit (Crafted Legendary pants) Legendary affix: None Inherent affixes: None	Oppressors and Warscarred Ravagers. (Huge winged melee fighting demons.) Bounty -- Torchlighter, Act 4, Gardens of Hope first tier. Quest -- Vekriss, Act 5, Unearthed Ruins Level 2. (End boss of Covetous Shen's quest, The Jewel of Dirgest. Can only be done once, without Reset Quests. Fixed -- Belphegor, Act 5, Path of War. Story Mode only, encountered near the beginning of The Battlefields of Eternity quest. Event -- Korchoroth, Act 5, Battlefields of Eternity. (Boss of the Timeless Prison event.) Event -- Emikdeva, Act 5, The Crag of Eternity off of the Battlefields of Eternity. Part of The Demonic Prisoner event. Event -- Volux the Forgotten, Act 5, The Crag of Eternity area off of the Battlefields of Eternity, where he spawns as part of The War That Time Forgot event. Event -- Keeper Hashemel, Act 5, Infested Ruins area off of the Battlefields of Eternity. (Spawns during The Cursed Crystals event. Borgoth, Act 5, Realm of the Banished area via the Battlefields of Eternity.
Skull of Raylend	Helm of Rule (Crafted Legendary helm) Legendary affix: None. Inherent affixes: +626-750 Vitality +11% Chance to Block +4 random Affixes	Colossal Golgors. Bounty -- Bholen, Act 3, The Keep Depths Level 2. Bounty -- Garganug, Act 3, Rakkis Crossing. Bounty -- Gorog the Bruiser, Act 3, The Core of Arreat.
Sydyru Bone	Sydryu Crust (Crafted Legendary bow) Legendary affix: None Inherent affixes: +(981-1199)-(1175-1490) Poison Damage +5-7% Increased Attack Speed +9-10% damage to Elites +1 Primary and 2 secondary affixes	Bats. Bounty -- Glidewing, Act 1, Cathedral Level 1. Bounty -- Firestarter, Act 1, Cathedral Level 2. Event -- Sicklefang, Act 1, Fields of Misery. End boss of the Carrion Farm event. Bounty -- Hellscream, Act 2, The Unknown Depths dungeon below the Archives of Zoltun Kulle.
Symbol of the Guardian Brotherhood	Guardian's Jeopardy Item Set bonuses: (2): +250 Vitality (2): +2000 Regen per second (3): +15% Movement Speed	Demon Troopers. (The large, mace-wielding, melee brawlers.) Bounty -- Thromp the Breaker, Act 3, Skycrown Battlements. Bounty -- Obis the Mighty, Act 3, Skycrown Battlements. Fixed -- Dragus, Act 3, Stonefort. (Found near the Skycrown waypoint nearly every game in Adventure Mode.) Bounty -- Bashface the Truncheon, Act 3, Stonefort. Bounty -- Bricktop, Act 3, Stonefort. The Crusher, Act 3, The Keep Depths Level 2. Event -- Busaw, Act 3, Rakkis Crossing. End boss of the Crazy Climber event, which can be a bounty.
Torn Soul	Living Umbral Oath WD (Crafted Legendary ceremonial knife) Legendary affix: None Inherent affix: None	Khazra Shamans. (Goatmen mages.) Event -- Chupa Khazra, Act 1, Southern Highlands, in the goat amphitheater. Bounty -- Lorzak the Powerful, Act 1, Southern Highlands. Event -- Skehlinrath, Act 1, Southern Highlands. When the event spawns, found in a hut in the circular goat fortress.
Urn of Quickening	Kethrye’s Splint (Crafted Legendary bracers) Legendary affix: None Inherent affixes: None	Lacuni Huntresses. Saha the Slasher, Act 2, Howling Plateau. Bounty -- Taros the Wild, Act 2, Howling Plateau. Bounty -- Erach, Act 2, Stinging Winds. Bounty -- Raiha the Vicious, Act 2, Desolate Sands. Chiltara, Caverns of Frost level 2, dungeon below the Fields of Slaughter. Scathach the Savage, Act 3, Caverns of Frost Level 2, dungeon below the Fields of Slaughter. Bounty -- Zelusa the Grasping, Act 3, Caverns of Frost Level 2, dungeon below the Fields of Slaughter. Bounty -- Zelusa the Grasping, Act 3, Icefall Caves Level 2, dungeon below the Fields of Slaughter.
White Oak Splinter	Rozpedin's Force Monk (Crafted Legendary daibo) Legendary affix: None Inherent affixes: (1177-1439)-(1410-1788) Holy Damage +5 Random affixes	Wood Wraiths. (Walking trees.) Event -- The Old Man, Act 1, Fields of Misery. Hidden Grove, spawns when the golden chest is opened.
Wooden Stake	Blitzbolter DH (Legendary Hand crossbow) Legendary affix: None Inherent affixes: +(858-1049)-(1028-1304) Holy Damage +5 random affixes	Skeleton Archers. Bounty -- Killian Damort, Act 1, Cathedral Level 4. Bounty -- Belagg Pierceflesh, Act 3, The Keep Depths Level 3.
Woven Plate	Piro Marella (Crafted Legendary Crusader shield) Legendary affixes: Reduces the wrath cost of shield bash 40-50%. Inherent affixes: +5 random affixes	Skeletal Shieldbearers. Bounty -- Captain Cage, Act 1, Cathedral Level 4. Event -- Enmerkar, Act 1, Festering Woods. Spawns during the Last Stand of the Ancients event. Captain Donn Adams, Act 3, The Keep Depths Level 1.

Legendary Materials: Salvageable

There are two types of legendary material that are salvaged from legendary and set items, including crafted legendary/set items. One material comes from each salvaged item. They may also directly drop from Rift Guardians, in the appropriate level range.

Fiery Brimstone -- Level 1-60.
Forgotten Soul -- Level 61-70.

Forgotten Souls are the chief bottleneck for all end game crafting and legendary enchanting, and most players feel it is impossible to have too many, since at any moment a ring or amulet might require a dozen or more enchants to get the perfect affix.

Infernal Machine Legendary Materials

There are a number of legendary materials required to create the Infernal Machine and then to craft a Hellfire Ring in Reaper of Souls. The 4 types of keys drop only from the KeyWardens, and the 4 Demonic Organs drop only from the Ubers. See those articles for full details.

Diablo 3 has just 3 keys, 1 Machine, and 3 Ubers for 3 Organs. That info is also covered in the Infernal Machine article.

Staff of Herding Legendary Materials

Whimsyshire is the rainbow-colored Easter Egg level in Diablo 3, which remains accessible in Reaper of Souls.

Four legendary materials, the Gibbering Gemstone, Leoric's Shinbone, Liquid Rainbow, Wirt's Bell, are required to create the Staff of Herding, which is used to gain access to Whimsyshire. Going there is required in some cases, since two of the legendary materials can only be found from Uniques in Whimsyshire.

See the Whimsyshire article for full details.

Gallery

A collection of images of Legendary Materials.

Legendary Mats with "no icon" visuals during the RoS beta.
Legendary materials briefly gave off the beam of light graphic during the RoS beta.
Legendary materials were yellow-colored for a time during the beta.
Adventurer's Journal
Angelic Shard
Behistun Rune
Bloody Pincer
Born's Key
Captured Nightmare
Captured Soul
Cartographer's Toolkit
Cultist's Blood
Defiled Doll
Demon Skin
Element of Celerity
Griswold's Scribblings
Hilt of the Silver Wolf
Human Cartilage
Iron Wolves Doctrine
Living Flame
Lyekurns Diary
Maghda's Tormented Soul
Quaking Vial
Rydraelm tome
Shard of Entsteig
Shattered Core
Shimmering Quill
Shuddering Demon Bone
Skelon's Dice
Skull of Raylend
Sydyra Bone
Symbol of the Guardian Brotherhood
Torn Soul
Urn of Quickening
Wooden Stake
Woven Plate