Lucky color = monster element = drop rate + (?)

Cerberus (Lv47)
Drop: Sharp Beast Claw, Beast Horn, Black Fur, Crescent Moon
Attr: Dark
Weak: Light
Aggr: Under Active
Telete Forest - See Map

Flame Rocker (Lv49)
Drop: Turtle Shell, Hematite, ◇VIT+1, Crescent Moon
Attr: Fire
Weak: Water
Aggr: Passive
Scorched Tunnel - See Map

Gold Rocker (Lv294)
Drop: Heavy Stone, Gold Turtle Shell, Beaten Gold, Luster Ring
Attr: Light
Weak: Dark
Aggr: Passive
Philiza Coast - See Map

Grand Rocker (Lv45)
Drop: Turtle Shell, Hematite, Topaz, Iron Hammer
Attr: Earth
Weak: Fire
The Corda Pass - See Map

Fire Element (Lv54)
Drop: Small Ember, Spirit Silk, Blazing Hellfire, Tunic
Attr: Fire
Weak: Water
Aggr: Passive
Scorched Tunnel [B2] - See Map

Hanged Colon (Lv361)
Drop: Colon Leaf, Big Colon Leaf, Old Fire Fragment, Engraved Powder Case
Attr: Fire
Weak: Water
Aggr: Over Active
Pillar Plant Bed [Area 1] - See Map

Colon (Lv5)
Drop: Colon Leaf, Colon Bag, Nut, Wooden Cane
Attr: Earth
Weak: Fire
Aggr: Passive
Micerne Plains - See Map

Tuning Rod [Canes]
ATK: 290
MATK+15%, Magic pierce +10% Skill delay -1sec, Cast time -20% MP cost -25%, Hate rise -10%
MATK +15% Magic Pierce +10% Skill Delay -1.0s MP Cost -25% Hate Rise -10% Cast Time -20%

Production
Tuning Rod x1 [Canes]
Carpentry Lv233
1: Wooden Cane x1
2: Serene Breeze x1
3: Magic Wood x1

Coukd correspond with their weakness even ie blue=water so you farm wind boss. It would make sense with the way sets work for prod etc...