ALL CREDIT goes to 
ANGZT


This guide should serve as the one place you want to look when you're wondering where to get the Legendary crafting materials for your level 70 Legendary and Set craftable items as well as what they're good for when you've found some while slaying the monsters of Sanctuary.


Intro:
With the release of Reaper of Souls, many new level 70 crafting recipies are being added which require an additional Legendary material besides Forgotten Souls, the level 61-70 version of Fiery Brimstones, acquired by salvaging level 61-70 items.
These additional materials can each be acquired from sepcific monsters or lootable objects in the world, allowing players to focus on farming specific materials for the item they are looking to craft. This guide will detail how to acquire each of those materials and what they're used for.

While I've tried as best I could, I can of course not guarantee for the correctness and certainly not for the completeness of the information given here. However, keep in mind that none of the items have a 100% drop chance, so killing a certain monster a bunch of times without getting the desired item does not mean it doesn't drop it at all.
Please feel free to correct or add to anything I have listed here, I will attempt to update the main post as soon as possible. This is especially true for the "Acquired from" and even more so for the "How to farm" portions. If you find an item in a place that is not yet listed or believe another place might be better to go hunting for an item, please post it here.

Most of the items drop from SuperUnique monsters (the ones with a unique purple name and a title instead of their affixes below it), so keep an eye out for them!
It appears that most of the materials only drop for level 70 characters.
Adventurer's Journal and Grisworld's Scribblings can drop for lower level characters, even in vanilla Diablo 3. This is likely due to the fact that they drop from environment objects instead of monsters.



Adventurer's Journal

  • Acquired from: Act I-IV, many areas, many World Objects - lootable and breakable ones (probably no chests, though), a complete list seems pointless.
  • Where to farm: ?
  • Used for: Penders Purchase, Hands, 6 random magic properties
  • Note: Can be acquired in Patch 2.0.1+ vanilla Diablo 3.




Angelic Shard

  • Acquired from: Act IV, The Great Span, Izual (Quest spawn Corrupted Angel)Act IV, Multiple Areas, Corrupted Angel
  • Where to farm: Act IV, The Great Span, Quest: Prime Evil (start)
  • Used for: Hallowed Barricade, Shield, Holy skills deal 15–20% more damage, 5 random magic propertiesHallowed Baton, Wand, +(981–1199)–(1175–1490) Holy Damage, 5 random magic properties
    Hallowed Breach, 1h Axe, +(981–1199)–(1175–1490) Holy Damage, 5 random magic properties
    Hallowed Condemnation, Hand Crossbow, +(858–1049)–(1028–1304) Holy Damage, 5 random magic properties
    Hallowed Hold, Fist Weapon, +(981–1199)–(1175–1490) Holy Damage, 5 random magic properties
    Hallowed Nemesis, 1h Mighty Weapon, +(981–1199)–(1175–1490) Holy Damage, 5 random magic properties
    Hallowed Sufferance, Ceremonial Knife, +(1098–1316)–(1644–1959) Holy Damage, 5 random magic properties
  • Set bonus Hallowed Protectors: (2): +100 Resistance to All Elements, Attack Speed Increased by 10.0%




Behistun Rune

  • Acquired from: Act I, Leoric's Manor, Krailen the Wicked (Rare spawn Dark Summoner)Act II, Road to Alcarnus, Yeth (Rare spawn Hellion)
  • Where to farm: Needs testing.
  • Used for: Mark of the Magi, Staff, +(1177–1439)–(1410–1788) Arcane Damage, 5 random magic properties




Bloody Pincer

  • Acquired from: Act V, Ruins of Corvus, Balata (Rare spawn Scarab)
  • Where to farm: Act V, Ruins of Corvus
  • Used for: Demon Claw, Fist Weapon, +(981–1199)–(1175–1490) Fire Damage, 5 random magic properties




Born's Key

  • Acquired from: Act I, Cemetery of the Forsaken, Lucious the Depraved (Rare spawn Zombie)
  • Where to farm: Act I, Cemetery of the Forsaken (outside, not in the crypts)
  • Used for: Born's Frozen Soul, Chest, 6 random magic propertiesBorn's Furious Wrath, 1h Sword, +(981–1199)–(1175–1490) Holy Damage, 5 random magic properties
    Born's Privilege, Shoulders, 6 random magic properties
  • Set bonus Born's Command: (2): +15% Life, (3): Reduces cooldown of all skills by 10.0%, Increases Bonus Experience by 20%




Captured Nightmare

  • Acquired from: Act IV, The Silver Spire Level 2, Grimnight the Soulless (Rare spawn Enslaved Nightmare)Act IV, The Silver Spire Level 1 and 2, common Terror Demons and Enslaved Nightmares
  • Where to farm: Act IV, The Silver Spire Level 2
  • Used for: Night's Reaping, 1h Mighty Weapon, +(981–1199)–(1175–1490) Cold Damage, +14–18% Life, 4 random magic properties




Captured Soul

  • Acquired from: Act III, The Keep Depths Level 2, Aloysius the Ghastly (Rare spawn Soul Ripper)
  • Where to farm: Act III, The Keep Depths Level 2
  • Used for: Lai Yui's Persuader, Daibo, +(1177–1439)–(1410–1788) Cold Damage, 5 random magic properties




Cartographer's Toolkit

  • Acquired from: Act III, Rakkis Crossing, Blaze of Glory Event, Lavarinth (Event spawn Ghoul)Act III, Rakkis Crossing, Blaze of Glory Event, Lavarinth (Event spawn Ghoul)
    Act III, Tower of the Damned Level 1, Gholash (Rare spawn Ghoul)
    Act I, Festering Woods, Ancient War Event, Enkidu
  • Where to farm: Act III, Rakkis Crossing, Blaze of Glory Event
  • Used for: Board Walkers, Feet, +10–12% Movement Speed, 5 random magic properties




Cultist Blood

  • Acquired from: Act I, Halls of Agony Level 1, Cultist Grand Inquisitor (Common spawn Cultist)Act II, Alcarnus, High Cultist Murdos (Rare spawn Cultist)
    Act II, Alcarnus, Jhorum the Cleric (Rare spawn Cultist)
  • Where to farm: Act I, Halls of Agony Level 1
  • Used for: Blood-Magic Edge, Dagger, +(858–1049)–(1028–1304) Damage, Increases Attack Speed by 5–7%, Blood oozes from you, 3 random magic properties




Defiled Doll

  • Acquired from: Act IV, The Silver Spire Level 1, Kysindra the Wretched (Rare spawn Succubus)
  • Where to farm: Act IV, The Silver Spire Level 1
  • Used for: Spite, Mojo, +(279–348)–(280–418) Damage, Critical Hit Chance Increased by 8.0–10.0%, +120–150 Maximum Mana (Witch Doctor Only), 4 random magic properties




Demon Skin

  • Acquired from: Act III, The Core of Arreat, Axgore the Cleaver (Rare spawn Phase Beast)Act III, Tower of the Damned Level 1, Haxxor (Rare spawn Phase Beast)
    Act IV, Gardens of Hope Tier 1, Khatun (Rare Spawn Sky Terror)
    Act IV, Gardens of Hope Tier 2, Razorclaw (Quest spawn Sky Terror, spawns during quest The Light of Hope)
  • Where to farm: Act IV, Quest The Light of Hope, Gardens of Hope Tier 2 (near Teleporter to The Crystal Colonnade)
  • Used for: Demon's Aileron, Shoulders, 6 random magic propertiesDemon's Animus, Wrists, 6 random magic properties
    Demon's Marrow, Torso, 6 random magic properties
    Demon's Plate, Legs, 6 random magic properties
    Demon's Restraint, Waist, 6 random magic properties
  • Set bonus Demon's Hide: (2): Ranged and melee attackers take 6000 Fire damage per hit, (3): Chance to Deal 25% Area Damage on Hit, (4): +15% Damage to Demons, Chance to reflect projectiles when you are hit by enemies.




Element of Celerity

  • Acquired from: Act I, The Weeping Hollow, Mange (Rare spawn Scavenger)Act I, Fields of Misery, Forlon Farm Event, Burrow Bile (Event spawn Scavenger)
    Act I, Fields of Misery, Dreadclaw the Leaper (Rare spawn Scavenger)
    Act I, Watch Tower Level 2, Scavenged Scabbard Event, Armorer's Bane (Event spawn Scavenger)
  • Where to farm: Act I, Fields of Misery
  • Used for: Fleeting Strap, Waist, Attack Speed Increased by 5.0–7.0%, 5 random magic properties




Essence of the Twin Seas

  • Acquired from: Act II, Black Canyon Mines, Razormouth (Rare spawn Dune Thresher)Act II, Sewers of Caldeum, Moontooth Dreadshark (Rare spawn Dune Thresher, appears from some rubble)
  • Where to farm: Act II, Black Canyon Mines
  • Used for: Captain Crimson's Silk Girdle, Waist, 6 random magic propertiesCaptain Crimson's Thrust, Legs, 6 random magic properties
    Captain Crimson's Waders, Feet, 6 random magic properties
  • Set bonus Captain Crimson's Trimmings: (2): Regenerates 2000 Life per Second, Reduces cooldown of all skills by 10.0%, (3): +50 Resistance to All Elements, Reduces all resource costs by 10%




Eternal Power Capsule

  • Acquired from: Act I, Whimsyshire, Evil Oliver (Rare spawn Cuddle Bear)
  • Where to farm: Act I, Whimsyshire (aka Pony Level)
  • Used for: Arcane Barb, Crossbow, +(981–1199)–(1175–1490) Arcane Damage, 5 random magic properties




Eyes of the Dead

  • Acquired from: Act I, Leoric's Passage, Headcleaver (Quest spawn Skeleton)Act I, Cathedral Level 2, Merrium Skullthorn (Rare spawn Skeleton)
  • Where to farm: Act I, Leoric's Passage, Quest The Legacy of Cain - Explore Cellar
  • Used for: War of the Dead, 2h Mighty Weapon, (1992–2254)–(2304–2682) Damage, 5 random magic properties




Frozen Blood

  • Acquired from: Act III, Caverns of Frost, Chiltara (Rare spawn Lacuni) (unconfirmed)
  • Where to farm: ?
  • Used for: Utar's Roar, 1h Axe, +(981–1199)–(1175–1490) Cold Damage, Cold skills deal 15–20% more damage, 4 random magic properties




Glowing Ore

  • Acquired from: Act V, Pandemonium, unknown rare spawn Scavenger (unconfirmed)
  • Where to farm: ?
  • Used for: Cosmic Strand, Source, Teleport gains the effect of the Wormhole rune, 5 random magic properties




Grisworld's Scribblings

  • Acquired from: Act I, Cathedral, BookshelvesAct I, Cemetery of the Forsaken, Gravedigger's corpse
    Act I, Festering Woods, Enmerkar (Last Stand of the Ancients Event)
    Act I, Wortham Chapel, Bookshelves
    Act II, Khasim Outpost, Cain's Lost Satchel
    Act II, Khasim Outpost, Imperial Guard Supplies (normally drops the "Captain's Order")
    Act II, Zoltun Kulle dungeons, Bookcases
    Act III, Skycrown Battlements, Morgan's Satchel
    Act III, The Keep Depths, Lore objects
    Act IV, Multiple areas, Angiris Archives
  • Where to farm: Act I, Cathedral, Bookshelves
  • Used for: Griswold's Perfection, 1h Sword, +(981–1199)–(1175–1490) Fire Damage, 5 random magic properties
  • Note: Can be acquired in Patch 2.0.1+ vanilla Diablo 3.




Hilt of the Silver Wolf

  • Acquired from: Act III, Arreat Crater Level 1, Growlfang (Rare spawn Fallen Hound)
  • Where to farm: Act III, Arreat Crater Level 1
  • Used for: Golden Scourge, 1h Flail, Holy skills deal, 15–20% more damage, Smite now jumps to 3 additional enemies, 6 random magic properties (might be only 3 properties?)




Human Cartilage

  • Acquired from: Act I, Defiled Crypt Level 2, Manglemaw (Grotesque, spawns during quest A Shattered Crown)Act I Halls of Agony Level 2, A Stranger in Need Event, Tormented Behemoth (Event spawn Grotesque)
  • Where to farm: Testing needed: Manglemaw is found in the crypt where Leoric's Crown is, the Stranger in Need Event is right below the exit to the Highlands Passage.
  • Used for: Wall of Man, Shield, 20–30% chance to be protected by a shield of bones when you are hit, 5 random magic properties



Iron Wolves Doctrine

  • Acquired from: Act II, Dahlgur Oasis, Ssthrass (Common spawn Deceiver Magi)
  • Where to farm: Act II, Dahlgur Oasis (just outside the entrance to the Ancient Waterway)
  • Used for: Asheara's Custodian, Shoulders, 6 random magic propertiesAsheara's Finders, Feet, 6 random magic properties
    Asheara's Pace, Legs, 6 random magic properties
    Asheara's Ward, Hands, 6 random magic properties
  • Set bonus Asheara's Vestments: (2): +100 Resistance to All Elements, (3): +20% Life, (4): Attacks cause your followers to occasionally come to your aid.




Living Flame

  • Acquired from: Act IV, The Silver Spire Level 2, Sao'Thall (Rare spawn Morlu Caster)Act IV, The Silver Spire Level 2, Rhau'Kye (Rare spawn Morlu Caster)
    Act IV, Radiant Chapel, Malfeas the Abhorrent (Rare spawn Morlu Caster)
  • Where to farm: Act IV, The Silver Spire Level 2
  • Used for: Cinder Switch, 1h Axe, +(1177–1439)–(1410–1788) Fire Damage, 25–50% chance to cast a fireball when attacking, 4 random magic properties




Lyekurn's Diary

  • Acquired from: Act III, Heart of Sin, Azmodan
  • Where to farm: Act III, Quest Heart of Sin (Kill Azmodan), Heart of Sin
  • Used for: Corruption, Shoudlers, 5 random magic properties




Maghda's Tormented Soul

  • Acquired from: Act II, Lair of the Witch, Maghda
  • Where to farm: Act II, Quest City of Blood (Lair of the Witch), Lair of the Witch
  • Used for: Cain's Habit, Legs, 6 random magic propertiesCain's Insight, Head, 6 random magic properties
    Cain's Scrivener, Hands, 6 random magic properties
    Cain's Travelers, Feet, 6 random magic properties
  • Set bonus Cain's Destiny: (2): Attack Speed Increased by 8.0%, (3): 50% Better Chance of Finding Magical Items, Increases Bonus Experience by 50%




Mystical Source

  • Acquired from: Act I, Whimsyshire, Midnight Sparkle (Rare spawn Purple Pony)
  • Where to farm: Act I, Whimsyshire (aka Pony Level)
  • Used for: Sage's Apogee, Head, Empty Socket, 5 random magic propertiesSage's Passage, Feet, 6 random magic properties
    Sage's Purchase, Hands, 6 random magic properties
  • Set Bonus Sage's Journey: (2): +250 Strength, +250 Dexterity, +250 Intelligence, +250 Vitality, (3): Whenever a Death's Breath drops, a second one will also drop.




Phial of Weakness

  • Acquired from: Act III, The Battlefields, Deadgrasp (Rare spawn Herald of Pestilence)Act III, The Battlefields, Triage Event, Handible (Event spawn Herald of Pestilence)
  • Where to farm: Act III, The Battlefields
  • Used for: Atrophy, Wand, +(981–1199)–(1175–1490) Fire Damage, 5 random magic properties




Quaking Vial

  • Acquired from: Act IV, Hellrift, Sledge (Quest spawn Mallet Lord)
  • Act IV, Hellrift, Hammermash (Quest spawn Mallet Lord)
  • Where to farm: Act IV, Quest The Light of Hope, Hellrifts in either Tier of the Gardens of Hope
  • Used for: Sunder, 2h Mace, +(1177–1439)–(1410–1788) Fire Damage, 25–50% chance to sunder the ground your enemies walk on when you attack, 4 random magic properties




Reaper's Fear

  • Acquired from: Act V, ?, Malthael (unconfirmed)
  • Where to farm: ?
  • Used for: Reaper's Wraps, Wrists, Health globes restore 25–30% of your primary resource, 8 random magic properties (might be only 5 properties?)




Rydraelm Tome

  • Acquired from: Act II, Dalguhr Oasis, Ashangu (Rare spawn Fallem Shaman, stands on a little plateau over a pond, spawns Deranged Fallen (the exploding ones))Act II, Dalguhr Oasis, Bashiok (Rare spawn Fallem Shaman)
  • Where to farm: Act II, Dalguhr Oasis
  • Used for: Mantle of the Rydraelm, Torso, 6 random magic properties




Shard of Entsteig Plate

  • Acquired from: Act I, Defiled Crypt, The Matriarch's Bones Event, Lord Dunhyld (Event spawn Enraged Phantom)Act I, The Festering Woods, Feklar's Ghost (Rare spawn Enraged Phantom)
    Act II, Sewers of Caldeum, Shade of Nar Gulle (Rare spawn Enraged Phantom)
    Act II, Unknown Dephts, The Archivist (Rare spawn Enraged Phantom)
  • Where to farm: Needs testing, I believe Act I, The Festering Woods might be the best choice.
  • Used for: Aughild's Power, Shoulders, 6 random magic propertiesAughild's Rule, Torso, 6 random magic properties
    Aughild's Search, Wrists, 6 random magic properties
    Aughild's Spike, Head, +91–100 Resistance to All Elements, 5 random magic properties
  • Set Bonus Aughild's Authority: (2): Reduces damage from ranged attacks by 7.0%, Reduces damage from melee attacks by 7.0%, (3): Reduces damage from elites by 15.0%, Increases damage against elites by 15%




Shattered Core

  • Acquired from: Act II, Forgotten Ruins, Ancient Guardian (Rare spawn Sand Dweller)Act II, Unknown Depths, Rockgut (Rare spawn Sand Dweller)
  • Where to farm: Act II, Forgotten Ruins
  • Used for: Devastator, 1h Mace, +(981–1199)–(1175–1490) Fire Damage, Fire skills deal 15–20% more damage, 4 random magic properties




Shimmering Quill

  • Acquired from: Unknown rare spawn Quill Beast
  • Where to farm: ?
  • Used for: Unbound Bolt, Bow, +(981–1199)–(1175–1490) Cold Damage, Increases Attack Speed by 5–7%, Critical Hit Damage Increased by 31.0–35.0%, 3 random magic properties




Shuddering Demon Bone

  • Acquired from: Act IV, Gardens of Hope 2nd Tier, Kao' Ahn (Rare spawn Morlu){*]Act IV, Gardens of Hope 2nd Tier, Oah' Tash (Rare spawn Morlu)
  • Where to farm: Act IV, Gardens of Hope 2nd Tier
  • Used for: Archfiend Arrows, Quiver, Attack Speed Increased by 15.0–20.0%, Critical Hit Chance Increased by 8.0–10.0%, Increases damage against elites by 5–8%, 4 random magic properties




Skeleton's Dice

  • Acquired from: Act IV, Gardens of Hope 1st Tier, Torchlighter (Rare spawn Opressor)Act V, Battlefields of Eternity, Emikdeva (Rare spawn Warscarred Ravager, appears from a Timeless Prison)
    Act V, Battlefields of Eternity, Korchoroth (Rare spawn Warscarred Ravager, appears from a Timeless Prison)
  • Where to farm: Act V, Battlefields of Eternity
  • Used for: Skelons Deceit, Legs, 6 random magic properties




Skull of Raylend

  • Acquired from: Act III, The Keep Depths Level 2, Bholen (Rare spawn Colossal Golgor)
  • Where to farm: Act III, The Keep Depths Level 2
  • Used for: The Helm of Rule, Head,+626–750 Vitality, +11% Chance to Block, 4 random magic properties




Sydyru Bone

  • Acquired from: Act I, Cathedral Level 1, Glidewing (Rare spawn Bat)Act I, Cathedral Level 2, Firestarter (Rare spawn Bat)
    Act I, Fields of Misery, Carrion Farm Event, Sicklefang (Event spawn Bat)
    Act III, Unknown Depths, Hellscream (Rare spawn Bat)
  • Where to farm: Needs testing, I believe Act I, Fields of Misery might be the best choice as the event is easy to find and spawns frequently.
  • Used for: Sydyru Crust, Bow, +(981–1199)–(1175–1490) Poison Damage, Increases Attack Speed by 5–7%, Increases damage against elites by 9–10%, 3 random magic properties




Symbol of the Guardian Brotherhood

  • Acquired from: Act III, Stonefort, Bashface the Truncheon (Rare spawn Demon Trooper)Act III, Stonefort, Waiting for Reinforcements Event, Dragus (Event/Quest spawn Demon Trooper, spawns during Quest Turning the Tide)
    Act III, The Keep Depths Level 2, The Crusher (Rare spawn Demon Trooper)
    Act III, Rakkis Crossing, Crazy Climber Event, Busaw (Event spawn Demon Trooper)
  • Where to farm: Act III, Quest Turning the Tide, Stonefort (not far from the entrance, speak to Captain Haile)
  • Used for: Guardian's Aversion, Wrists, 6 random magic propertiesGuardian's Case, Waist, 6 random magic properties
    Guardian's Gaze, Head, +10–12% Movement Speed, 5 random magic properties
  • Set Bonus Guardian's Jeopardy: (2): +250 Vitality, Regenerates 2000 Life per Second, (3): +15% Movement Speed




Torn Soul

  • Acquired from: Act I, Southern Highlands, Lorzak the Powerful (Rare spawn Khazra Shaman)Act I, Southern Highlands, Skehlinrath (Rare spawn Khazra Shaman)
  • Where to farm: Act I, Southern Highlands
  • Used for: Living Umbral Oath, Ceremonial Knife, +(981–1199)–(1175–1490) Damage, 5 random magic properties




Urn of Quickening

  • Acquired from: Act III, Caverns of Frost Level 2, Chiltara (Rare spawn Lacuni Huntress)Act III, Caverns of Frost Level 2, Scathach the Savage (Rare spawn Lacuni Huntress)
  • Where to farm: Act III, Caverns of Frost Level 2
  • Used for: Kethryes' Splint, Wrists, 6 random magic properties




White Oak Splinter

  • Acquired from: Act I, Fields of Misery, Secluded Grove, The Old Man (Rare spawn Wood Wraith) (unconfirmed)
  • Where to farm: ?
  • Used for: Rozpedin's Force, Daibo, (1741–2003)–(2456–2834) Damage, 5 random magic properties




Wooden Stake

  • Acquired from: Likely unknown rare/event spawn Skeletal Archer
  • Where to farm: ?
  • Used for: Blitzbolter, Hand Crossbow, +(858–1049)–(1028–1304) Holy Damage, 5 random magic properties




Woven Plate

  • Acquired from: Act I, Festering Woods, The Last Stand of the Ancients Event, Enmerkar (Event spawn Skeletal Shieldbearer)Act III, The Keep Depths Level 1, Captain Donn Adams (Rare spawn Skeletal Shieldbearer)
  • Where to farm: Act I, Festering Woods, The Last Stand of the Ancients Event
  • Used for: Piro Marella, Crusader Shield, Reduces the Wrath cost of Shield Bash by 40–50%, 8 random magic properties (might be only 5 properties?)




Sources:
Battle.net - Crafting Material,
Blizzplanet - Legendary Crafting Materials,
Battle.net Forums - All Legendary Crafting Mats List & Location!


출처 - http://diablo.incgamers.com/forums/showthread.php?853445-Legendary-Crafting-Info-drop-locales