Item synthesis

Item synthesis is the process of creating items, armor, weapons, and accessories using various synthesis materials found throughout various worlds. The occational third item right of the enemies is a best location for getting this type of items.

Synthesis Items

Kingdom Hearts

Shards

Bright Shard-->Green Requiem
Blaze Shard-->Red Nocturne
Frost Shard-->Blue Rhapsody
Thunder Shard-->Yellow Opera
Mythril Shard-->Barrel Spider,Behemoth,Pot Spider
Power Shard-->Bouncywild,Powerwild
Spirit Shard-->Large Body,Soldier
Lucid Shard-->Shadow

Gems

Blaze Gem-->Bandit, Fat Bandit
Frost Gem-->Sea Neon, Sheltering Zone
Thunder Gem-->Aquatank,Screwdiver
Mythril Gem-->Angel Star, Behemoth
Bright Gem-->Search Ghost
Power Gem-->Air Pirate, Battleship, Pirate
Lucid Gem-->Gargoyle, Wight Knight

Crystal

Bright Crystal-->Defender
Lucid Crystal-->Darkball
Mystery Goo-->Rare Truffle, White Mushroom, Black Fungus
Power Crystal-->Wyvern
Shiny Crystal-->Wizard
Orichalcum-->Behemoth, Invisible
Bright Crystal-->Defender
Gale-->Angel Star

Kingdom Hearts II

Twilight Materials

Twilight Shard --> Gambler, Dusk
Twilight Stone --> Dancer
Twilight Gem --> Assassin
Twilight Crystal --> Sorcerer

Dark Materials

Dark Shard --> Soldier, Shadow
Dark Stone --> Assault Rider, Nightwalker
Dark Gem --> Gargoyle Knight, Warrior
Dark Crystal --> Air Pirate

Blazing Materials

Blazing Shard --> Hammer Frame, Minute Bomb
Blazing Stone --> Tornado Step, Cannon Gun
Blazing Gem --> Fat Bandit, Fiery Globe
Blazing Crystal --> Crimson Jazz, Crescendo

Frost Materials

Frost Shard --> Lance Soldier, Hook Bat
Frost Stone --> Hot Rod, Aeroplane
Frost Gem --> Fortune Teller, Icy Cube
Frost Crystal --> Living Bone

Lightning Materials

Lightning Shard --> Bolt Tower, Rapid Thruster : First battle with Scar.
Lightning Stone --> Emerald Blues, Driller Mole
Lightning Gem --> Armored Knight, Surveillance Robot
Lightning Crystal --> Strafer, Devastator

Lucid Materials

Lucid Shard --> Trick Ghost, Rabid Dog
Lucid Stone --> Graveyard, Toy soldier, Wight Knight
Lucid Gem --> Shaman, Aerial Knocker
Lucid Crystal --> Morning Star

Power Materials

Power Shard --> Large Body, Creeper Plant
Power Stone --> Luna Bandit, Silver Rock
Power Gem --> Shaman, Aerial Knocker
Power Crystal --> Morning Star

Dense Materials

Dense Shard --> Dragoon, Creeper
Dense Stone --> Sniper
Dense Gem --> Samurai
Dense Crystal --> Berserker

Mythril Materials (Found on Chests and can also be synthesized)

Mythril Shard
Mythril Stone
Mythril Gem
Mythril Crystal

Bright Materials

Bright Shard --> Bulky Vendor, Creeper Plant, Soldier, Hook Bat, Minute Bomb, Rabid Dog
Bright Stone --> Bulky Vendor, Aeroplane, Driller Mole, Luna Bandit, Tornado Step, Wight Knight, Cannon Ball, Silver Rock
Bright Gem --> Bulky Vendor, Aerial Knocker, Magnum Loader, Surveillance Robot
Bright Crystal --> Bulky Vendor, Air Pirate, NeoShadow, Strafer, Crescendo

Energy Materials

Energy Shard --> Bolt Tower, Gargoyle Knight/Warrior, Nightwalker
Energy Stone --> Hammer Frame, Lance Soldier, Trick Ghost
Energy Gem --> Emerald Blues, Fortuneteller
Energy Crystal --> Bookmaster, Shaman

Serenity Materials

Serenity Shard --> Assault Rider, Fat Bandit, Graveyard, Hot Rod, Large Body, Toy Soldier, Creeper
Serenity Stone --> Crimson Jazz, Devastator, Living Bone, Morning Star, Dusk
Serenity Gem --> Dancer, Dragoon, Gambler, Sniper
Serenity Crystal --> Assassin, Berserker, Samurai, Sorcerer

Orichalcum (Found in Chest and after Important events of the game, Bulky Vendor also drops them)

Orichalcum --> Bulky Vendor
Orichalcum+

The Orichalcum+ can only be found under these circumstances:

Space Paranoids - Central Computer Mesa (chest)
Twilight Town - Sunset Terrace (as Sora) (chest)
The World That Never Was - The Brink of Despair (chest)
100 Acre Wood - Finish Starry Hill
Atlantica - Finish "A New Day is Dawning"
Olympus Coliseum - Beat Goddess of Fate Cup
Any Moogle Shop - Get at least one of every other synthesis materials