J'ai trouvé un post qui cite les loots de matériels pour le craft :
J'ai testé sur 2 loots de rank E, ca correspond mais je n'ai pas la certitude pour le reste.
Apparemment les taux de loot sont plutôt bas dans ce jeu 
Rank E:
Hermit shell: crab monsters
Elemental remains: Elementles
Scorpion tail: scorpion monsters
Spring hare's ear: rabbit monsters
Garnet: Thugs, musicians, Imperial bishops
Papyrus page A: Imperial priests, imperial bishops
Papyrus page B: Court musicians, ogre mage
Copper ore:
Iron ore: Knights, Skelaton knights, soldier
Valks: Holy knights, spiders, talos
Cadmia: salamanders
Kyanus: huge rat, Tarantula
Touchstone beginners: orcus, spider, tarantula
Touchstone intermediate: orcus mage, tarantula, Deep ones
Rank D
Cursed bones: Black rat, skeleton monsters
Griffon feathers: Griffon monsters
Wraith soul: undead swordman monsters
Divine clay: golem monsters
Foul neckbeard: Ape monsters
Leopard skin: cat monsters
Merfolk gills: Mermaid monsters
Lazurite: slave traders, merman, giant squid, dark elemental, Light elemental
Steel ore: Elite knight, swordsmen
Damascus ore: deep ones, Elite knight
Fairy tears: Deep ones, swordsmen
Platinum ore: destroyer, Cyclops
Spinel: Imperial archer, Elite rat, talos
Ivory: Elephant monsters
Lunar crystal:
Solar crystal: Grendal, sasquash
Minium:
Fluorite: arch arocus,
Rank C:
Hellspawn horn: Cyclops, grendal
Arborus hand: tree monsters
Krakens legs: squid monsters
Orchid powder: orchid, orchid queen
Ruby: Black knight, slave traders, Dark bishop, dark elemental, holy elemental
Beryl: Court musician, boar god, kraken, silver talos
Papyrus page C: basilisk
Obsidian: dark lizard, typhon
Stagnum: pterousaur, ignis talos
Advanced touchstone: destroyer, boar god, salamander
Rank B
Ambergris: dragon monsters
Ptrerodactyl's beak: Pterodactyl monsters
Pearl: puppet master
Astral crystal: Triton, gold armored female, black iron golem
Papyrus page D: Ochu, triton
Realgar: pteranodon
Malachite: Elite gladiator
Touchstone special: rich swordsmen, silver armored female
Rank A
Outrage: silver dragon, gold dragon post game dungeon
Kongoseki: gold dragon post game dungeon
Genesis crystal: boar god, gold armored female post game dungeon
Duck crystal: dead dragon post game dungeon
Touchstone non-standard: electrum golem post game dungeon
Moldavite: made for 4mil gold think was after level 35 post game dungeon
Rank S
Overlord crown: reward stage 16 and 29, death drops stage 41, post game dungeon chest 10 and 41
Golden wheat: reward stage 11, 25, and 37. post game dungeon chest 10 and 41
Carage: reward stage 7, 12, 16, 20, 25, 30, 36, 41 post game dungeon chest 10 and 4
talos upgrade: reward stage 15 and 32
Source : http://www.gamefaqs.com/boards/620232-tears-to-tiara-ii-heir-of-the-overlord/70373388?page=2