[Guide] Legendary Crafting Materials - Drop locations & uses

Credits: DiabloFans

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 also be acquired in Patch 2.0.1+ vanilla Diablo 3 by characters of any level.


Angelic Shard


Act IV, Multiple Areas, Corrupted Angel
Act V, Pandemonium Fortress Level 2, Celic (Rare spawn)

  • 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 properties

Hallowed 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


  • Where to farm: Needs testing.
  • Used for: Mark of the Magi, Staff, +(1177–1439)–(1410–1788) Arcane Damage, 5 random magic properties


Bloody Pincer


  • Where to farm: Testing needed.
  • Used for: Demon Claw, Fist Weapon, +(981–1199)–(1175–1490) Fire Damage, 5 random magic properties


Born's Key

Born'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


  • 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


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


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


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 properties

Demon'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


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


Captain 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


  • 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, Battlefields of Eternity, Sartor (Rare spawn Primordial Scavenger)
  • Where to farm: Act V, Battlefields of Eternity
  • Used for: Cosmic Strand, Source, Teleport gains the effect of the Wormhole rune, 5 random magic properties


Grisworld's Scribblings


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 also be acquired in Patch 2.0.1+ vanilla Diablo 3 by characters of any level.


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


  • 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

Asheara'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


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

Cain'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

Sage'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


  • 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, Heart of the Fortress, Malthael
  • Where to farm: Act V, Heart of the Fortress
  • Used for: Reaper's Wraps, Wrists, Health globes restore 25–30% of your primary resource, 5 random magic properties (as opposed to the 8 properties according to Battle.net)
  • Note: Malthael also drops the Recipe for Reaper's Wraps.


Rydraelm Tome



Shard of Entsteig Plate


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 properties

Aughild'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


  • 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


  • Where to farm: Act III, Keep Depths Level 1
  • 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


  • 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


Skelon's Dice


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


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


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 properties

Guardian'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


  • 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


Act V, Heart of the Fortrtess, Malthael

  • 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: Act I, Cathedral Level 4, Killian Damort(Rare spawn Skeletal Archer)
  • Where to farm: Act I, Cathedral Level 4
  • Used for: Blitzbolter, Hand Crossbow, +(858–1049)–(1028–1304) Holy Damage, 5 random magic properties


Woven Plate


  • 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:
The RoS Legendary Crafting Material Challenge on Diablo IncGamers by HardRock Battle.net - Crafting Material,
Blizzplanet - Legendary Crafting Materials,
Playing the German version? Here and ere are versions with German item and monster names. I don't know how much they'll be updating it, though.
Changelog:

Adventurer's Journal and Grisworld's Scribblings.
Spelling fixes.

Where to find Adventurer's Journal now more general.
Changed note for Adventurer's Journal and Grisworld's Scribblings, clarifying that characters of any level can find them.

Added confirmed location for Reaper's Fear and added a note for the plans as well as the confirmed stats.
Added Pyres the Damned as a location for Angelic Shard.
Reformatted this changelog.

Added Malthael as a location for Urn of Quickening.
Added Sartor as a location for Glowing Ore.
Replaced the battle.net source with its original source: The RoS Legendary Crafting Material Challenge on Diablo IncGamers by HardRock.
Added Killian Damort as a location for Wooden Stake.
Added Crabbs as a location for Bloody Pincer.
Added Celic as a location for Angelic Shard.
Added Sarkoth as a location for Shimmering Quill.
Added Links to German Guides at Diablo 3 - 4 Fansites and PCGames.de.