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My boulder barbarian would love some Reaper's Wraps but they require Reaper's Fear. I've found various other crafting plans that require legendary materials.

Where can I find Reaper's Fear and other legendary crafting materials? Are there places to farm these materials or is it all luck of the draw?

  • As far as I can see, You can only pray to the RNG gods. Not 100% sure though. – Arperum Mar 26 '14 at 13:38
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+150

This Diablo 3 Craftables Spreadsheet is particularly helpful when trying to figure out if you are in an area with a possible legendary crafting material drop.

Here is the same list in not so sortable form:

Legendary Crafting Materials:

  • Adventurer's Journal
  • Angelic Shard
    • Found in:
      • Act 4 - The Great Span: Izaul
      • Act 4 - Multiple Areas: Corrupted Angel
      • Act 4 - The Silver Spire Level 1: Pyres the Damned
      • Act 5 - Pandemonium Fortress Level 2: Celic
    • Used For: Hallowed Protectors Set
  • Behistun Rune
    • Found in:
      • Act 1 - Leoric's Manor: Krailen the Wicked
      • Act 2 - Road to Alcarnus: Yeth
    • Used For: Mark of the Magi
  • Bloody Pincer
    • Found in:
      • Act 3 - Tower of the Damned Level 2: Crabbs
      • Act 3 - The Core of Arreat: Scorpitox
      • Act 5 - Ruins of Corvus: Balata
    • Used For: Demon Claw
  • Born's Key
    • Found in:
      • Act 1 - Cemetary of the Forsaken: Lucious the Depraved
      • Act 1 - Defiled Crypt: Digger O'Dell
      • Act 1 - Defiled Crypt: Dataminer
      • Act 1 - Defiled Crypt: John Gorham
    • Used For: Born's Command Set
  • Captured Nightmare
    • Found in:
      • Act 4 - The Silver Spire Level 2: Grimnight the Soulless
      • Act 4 - The Silver Spire Level 1/2: Terror Demons and Enslaved Nightmares
    • Used For: Night's Reaping
  • Captured Soul
    • Found in:
      • Act 3 - The Keep Depths Level 2: Aloysius the Ghastly
    • Used For: Lai Yui's Persuader
  • Cartographer's Toolkit
    • Found in:
      • Act 1 - Festering Woods: Grimsmack
      • Act 1 - Festering Woods: Enkidu (Ancient War Event)
      • Act 3 - Rakkis Crossing: Lavarinth (Blaze of Glory Event)
      • Act 3 - Tower of the Damned: Gholash
    • Used For: Board Walker's
  • Cultist Blood
    • Found in:
      • Act 1 - Halls of Agony: Cultist Grant Inquisitor
      • Act 2 - Alcarnus: High Cultist Murdos
      • Act 2 - Alcarnus: Jhorum the Cleric
    • Used For: Blood Magic Dagger
  • Defiled Doll
    • Found in:
      • Act 4 - The Silver Spire Level 1: Kysindra the Wretched
      • Act 5 - House of Deep Sorrow: Lady Victoria (Event Spawn)
    • Used For: Spite
  • Demon Skin
    • Found in:
      • Act 3 - The Core of Arreat: Axgore the Cleaver
      • Act 3 - Tower of the Damned Level 1: Haxxor
      • Act 4 - Gardens of Hope Tier 1: Khatun
      • Act 4 - Gardens of Hope Tier 2: Razorclaw
    • Used For: Demon's Hide Set
  • Element of Celerity
    • Found in:
      • Act 1 - The Weeping Hollow: Mange
      • Act 1 - Fields of Misery: Burrow Bile (The Forlorn Farm Event)
      • Act 1 - Fields of Misery: Dreadclaw the Leaper
      • Act 1 - The Lost Mine (Fields of Misery): Shanabi (Precious Ores Event)
      • Act 1 - Watch Tower Level 2: Armorer's Bane (Scavenged Scabbard Event) Used For: Fleeting Strap
  • Essence of the Twin Seas
  • Eternal Power Capsule
    • Found in:
      • Act 1 - Whimsyshire: Evil Oliver
    • Used For: Arcane Barb
  • Eyes of the Dead
    • Found in:
      • Act 1 - Leoric's Passage: Headcleaver (Quest Spawn)
      • Act 1 - Cathedral Level 2: Merrium Skullthorn
    • Used For: War of the Dead
  • Frozen Blood
    • Found in:
      • Act 3 - Caverns of Frost: Chiltara
    • Used For: Utar's Roar
  • Glowing Ore
    • Found in:
      • Act 5 - Battlefields of Eternity: Sartor
      • Act 5 - Pandemonium Fortress: Soul Scavenger (The Souls of Angels Event)
    • Used For: Cosmic Strand
  • Griswold's Scribblings
    • Found in:
      • Act 1 - Cathedral: Bookshelves
      • Act 1 - Cemetery of the Forsaken: Gravedigger's Corpse
      • Act 1 - Festering Woods: Enmerkar (Last Stand of the Ancients Event)
      • Act 1 - Wortham Chapel: Bookshelves
      • Act 2 - Khasim Outpost: Cain's Lost Satchel
      • Act 2 - Khasim Outpost: Imperial Guard Supplies
      • Act 2 - Zoltun Kulle Dungeons: Bookshelves
      • Act 3 - Skycrown Battlements: Morgan's Satchel
      • Act 3 - The Keep Depths: Lore Objects
      • Act 4 - Multiple Areas: Angel Archives
    • Used For: Griswold's Perfection
  • Hilt of the Silver Wolf
    • Found in:
      • Act 3 - Arreat Crater Level 1: Growlfang
      • Act 3 - Tower of the Damned Level 1: Gnawbone
    • Used For: Golden Scourge
  • Human Cartilage
    • Found in:
      • Act 1 - Cathedral Level 2: Cudgelarm
      • Act 1 - Defiled Crypt Level 2: Mangelmaw
    • Used For: Wall of Man
  • Iron Wolves Doctrine
  • Living Flame
    • Found in:
      • Act 4 - The Silver Spire Level 2: Sao'Thall
      • Act 4 - The Silver Spire Level 2: Rhau'Kye
      • Act 4 - Radiant Chapel: Malfeas the Abhorrent
    • Used For: Cinder Switch
  • Lyekurn's Diary
    • Found in:
      • Act 3 - The Heart of Sin: Azmodan
    • Used For: Corruption
  • Maghda's Tormented Soul
  • Mystical Source
    • Found in:
      • Act 1: Whimsyshire: Midnight Sparkle
      • Act 1: Whimsyshire: Nightmarity
      • Act 1: Whimsyshire: Team Unicorn
      • Act 1: Whimsyshire: Creampuff
    • Used For: Sage's Journey Set
  • Phial of Weakness
    • Found in:
      • Act 3 - The Battlefields: Deadgrasp
      • Act 3 - The Battlefields: Handible (Triage Event)
    • Used For: Atrophy
  • Quaking Vial
    • Found in:
      • Act 4 - Hellrift Level 1: Sledge
      • Act 4 - Hellrift Level 2: Hammermash
    • Used For: Sunder
  • Reaper's Fear
    • Found in:
      • Act 5 - Heart of the Fortress: Maltheal
    • Used For: Reaper's Wraps
  • Rydraelm Tome
    • Found in:
      • Act 2 - The Lost Caravan (Stinging Winds): Beyatt
      • Act 2 - Daulguhr Oasis: Ashangu
    • Used For: Mantle of the Rydraelm
  • Shard of the Ensteig Plate
    • Found in:
      • Act 1 - Defiled Crypt: Lord Dunhyld (The Matriarch of Bones Event)
      • Act 1 - Festering Woods: Feklar's Ghost
      • Act 1 - Festering Woods: Hawthorne Gable
      • Act 2 - Sewers of Caldeum: Shade of Nar Gulle
      • Act 2 - Unknown Depths: The Archivist (Event Spawn)
      • Act 2 - Tomb of Khan Dakab: Spirit of Khan Dakab (Event Spawn)
    • Used For: Aughild's Authority Set
  • Shattered Core
    • Found in:
      • Act 2 - Forgotten Ruins: Ancient Guardian
      • Act 2 - Unknown Depths: Rockgut
      • Act 2 - Realm of Shadow: Thrum
    • Used For: Devastator
  • Shimmering Quill
    • Found in:
      • Act 1 - Dank Cellar: Sarkoth
      • Act 1 - Musty Cellar: Gorathra
      • Act 3 - Keep Depths Level 1: Thornback
    • Used For: Unbound Bolt
  • Shuddering Demon Bone
    • Found in:
      • Act 4 - Gardens of Hope Tier 2: Koa' Ahn
      • Act 4 - Gardens of Hope Tier 2: Oah' Tash
    • Used For: Archfiend Arrows
  • Skeleton's Dice
    • Found in:
      • Act 4 - Gardens of Hope Tier 1: Torchlighter
      • Act 5 - Battlefields of Eternity: Emikdeva
      • Act 5 - Battlefields of Eternity: Korchoroth
    • Used For: Skeleton's Deceit
  • Skull of Raylend
    • Found in:
      • Act 3 - The Keep Depths Level 2: Bholen
      • Act 3 - Rakki's Crossing: Garganug
      • Act 3 - Core of Arreat: Gorog the Bruiser
    • Used For: The Helm of Rule
    • Sydyru Bone
    • Found in:
      • Act 1 - Cathedral Level 1: Gildewing
      • Act 1 - Cathedral Level 1: Firestarter
      • Act 1 - Fields of Misery: Sicklefang (Carrion Farm Event)
      • Act 3 - Unknown Depths: Hellscream
    • Used For: Sydyru Crust
  • Symbol of the Guardian Brotherhood
    • Found in:
      • Act 3 - Skycrown Battlements: Thromp the Breaker
      • Act 3 - Stonefort: Bashface the Truncheon
      • Act 3 - Stonefort: Dragus (Waiting for Reinforcements Event)
      • Act 3 - The Keep Depths Level 2: The Crusher
      • Act 3 - Rakkis Crossing: Busaw (Crazy Climber Event)
    • Used For: Guardian's Jeopardy Set
  • Torn Soul
    • Found in:
      • Act 1 - Southern Highlands: Lorzak the Powerful
      • Act 1 - Southern Highlands: Skehlinrath
    • Used For: Living Umbral Oath
  • Urn of Quickening
    • Found in:
      • Act 2 - Stinging Winds: Erach
      • Act 3 - Caverns of Frost Level 2: Chiltara
      • Act 3 - Caverns of Frost Level 2: Scathach the Savage
      • Act 3 - Icefall Caves: Zelusa the Grasping
      • Act 5 - Heart of the Fortress: Malthael (* May be a bug)
    • Used For: Kethryes' Splint
  • White Oak Splinter
    • Found in:
      • Act 1 - Secluded Grove (Fields of Misery): The Old Man
    • Used For: Rozpedin's Force
  • Wooden Stake
    • Found in:
      • Act 1 - Cathedral Level 4: Killian Damort
      • Act 3 - The Keep Depths Level 3: Belagg Pierceflesh
    • Used For: Blitzbolter
  • Woven Plate
    • Found in:
      • Act 1 - The Cathedral Level 4: Captain Cage
      • Act 1 - The Festering Woods: Enmerkar (The Last Stand of the Ancients Event)
      • Act 3 - The Keep Depths Level 1: Captain Donn Adams
    • Used For: Piro Marella

Infernal Machine Crafting Components:

Source for the various locations

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12

According to this page on Diablofans, only Malthael himself drops this specific crafting material:

  • 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.

This sounds pretty plausible to me as I also got the plan from him (which seems to be a guaranteed drop).

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