Wellspring

Wellspring, also dubbed as "Energy", is a material type introduced in . Energy materials contain the essences of spirit and strength combined, and are colored purple. In Kingdom Hearts, they are used as normal synthesis items, while in Kingdom Hearts II they are "modifier" materials that can be added to a recipe of the same rank to halve the materials needed to make it, and are usable once the Moogle reaches level 2, Novice Moogle. In Kingdom Hearts II, once all Energy materials are obtained the Moogle will reward Sora with a Power Boost.

Design
Wellspring materials are represented by jewels with a Modifier material structure. They are purple and have jagged, cyan patterns resembling bolts of electricity and swirls of air in them, reflecting the two essences the material contains.

Both the English and Japanese names of this material reflect the electrical bolts in the jewels. "Surging" references power surges that lightning can cause. Lightning is a flow of electric energy.

Kingdom Hearts

 * Power Crystal: Wyvern (2%)

Kingdom Hearts Final Mix introduced the Energy Stone, dropped only by the Stealth Soldier.

Kingdom Hearts II

 * Energy Shard: Bolt Tower (4%), Gargoyle Knight (4%), Gargoyle Warrior (4%), Nightwalker (4%)
 * Energy Stone: Hammer Frame (4%), Lance Soldier (4%), Trick Ghost (4%)
 * Energy Gem: Emerald Blues (4%), Fortuneteller (4%)
 * Energy Crystal: Bookmaster (4%), Shaman (4%)

Kingdom Hearts Birth by Sleep

 * Wellspring Crystal: Scrapper (30-50%), Triple Wrecker (90%).

Kingdom Hearts III

 * Wellspring Shard: Soldier (4%), Large Body (12%), Bizarre Archer (4%), Satyr (8%), Toy Trooper (8%), Powerwild (8%), Parasol Beauty (12%), Flood (4%), Gigas: Power Class (8%), Gigas: Speed Class (8%), Gigas: Gunner Class (8%), Beasts & Bugs (16%), Patchwork Animals (12%), Air Droids (4%), Bouncy Pets (4%), Supreme Smasher (16%), Olympus, Monstropolis
 * Wellspring Stone: Neoshadow (8%), Large Body (4%), Vitality Popcat (8%), Magic Popcat (8%), Focus Popcat (8%), Munny Popcat (8%), Rock Troll (30%), Metal Troll (30%), Pole Cannon (4%), Pogo Shovel (8%), Parasol Beauty (8%), Chief Puff (8%), Flowersnake (8%), Turtletoad (8%), Beasts & Bugs (8%), Patchwork Animals (4%), Air Droid (12%), Bouncy Pets (12%), Supreme Smasher (8%), Monstropolis
 * Wellspring Gem: High Soldier (8%), Rock Troll (20%), Metal Troll (20%), Mechanitaur (12%), Pogo Shovel (4%), Chaos Carriage (20%), Vaporfly (4%), Sea Sprite (Rainbow) (8%), Anchor Raider (20%), Spiked Turtletoad (10%), Monstropolis
 * Wellspring Crystal: High Soldier (12%), Helmed Body (4%), Anchor Raider (8%)

Kingdom Hearts II Final Mix

 * Energy Shard: Chest at the Halloween Town Square.
 * Energy Stone: Chest at the Wildebeest Valley.
 * Energy Crystal: Chest at the Crystal Fissure.

Kingdom Hearts Birth by Sleep

 * Terra: chest at the Palace Courtyard, chest at the Launch Deck.
 * Ventus: chest at the Hall, chest at the Gates, chest at the Gardens, chest at Pete's Rec Room, chest at the Mysterious Tower.
 * Aqua: chest at the Gates, chest at the Gardens.

Kingdom Hearts Birth by Sleep

 * Ventus: Collect 20 points in Ventus's Sticker Album.

Kingdom Hearts III

 * Wellspring Shard: Get a D rank in Verum Rex -Beat of Lead-; get a D rank in Festival Dance; get a D rank in Frozen Slider; get a D rank in Flash Tracer.
 * Wellspring Stone: Get a C rank in Verum Rex -Beat of Lead-; get a C rank in Festival Dance; get a C rank in Frozen Slider; get a C rank in Flash Tracer.

Kingdom Hearts III

 * Wellspring Shard: Wellspring Shard x3 is one of the possible Prize Postcard rewards.
 * Wellspring Stone: Wellspring Stone x2 is one of the possible Prize Postcard rewards.

Kingdom Hearts
Energy materials are used to synthesize the following items:
 * Heartguard (1 Power Crystal)
 * Power Up (1 Power Crystal)
 * Crystal Crown (3 Power Crystal)

Kingdom Hearts Final Mix
Energy materials are used to synthesize the following items:
 * Elixir (1 Power Crystal)
 * Defense Up (1 Power Crystal)
 * Crystal Crown (1 Power Crystal)
 * EXP Bracelet (1 Energy Stone)
 * Fantasista (5 Energy Stone)

Kingdom Hearts II
Energy materials are not listed in any recipe, but an Energy Crystal is required to synthesize the Ultima Weapon.

Kingdom Hearts Birth by Sleep
Wellspring materials are used to add the following abilities:
 * Combo Plus
 * Air Combo Plus
 * Once More

Kingdom Hearts III
Wellspring materials are used to synthesize the following items:
 * Ether (2 Wellspring Shard)
 * Hi-Ether (3 Wellspring Stone)
 * Mega-Ether (3 Wellspring Stone)
 * Elixir (3 Wellspring Crystal)
 * Megalixir (3 Wellspring Crystal)
 * (5 Wellspring Gem)
 * Magic Boost (5 Wellspring Gem)
 * Defense Boost (5 Wellspring Gem)
 * AP Boost (3 Wellspring Stone)
 * Ultima Weapon (2 Wellspring Crystal)
 * Buster Band (1 Wellspring Crystal, 2 Wellspring Gem)
 * Buster Band+ (1 Wellspring Crystal, 2 Wellspring Gem)
 * Blazing Crystal (1 Wellspring Crystal)
 * Frost Crystal (1 Wellspring Crystal)
 * Lightning Crystal (1 Wellspring Crystal)
 * Lucid Crystal (1 Wellspring Crystal)
 * Pulsing Crystal (1 Wellspring Crystal)
 * Writhing Crystal (1 Wellspring Crystal)
 * Soothing Crystal (1 Wellspring Crystal)

Notes and References
Fougue