Soul Gauge energy, or just  Soul, is a recurring subject in the  . It is a form of energy used for special attacks.
Sonic Storybook series
No explanation has been given to what properties Soul Gauge energy holds, although its name would imply it is derived from one's
soul. In gameplay, the player can gather Soul Gauge energy during Missions which is stored in the Soul Gauge. With Soul Gauge energy, the player is able to pull off special, extra powerful maneuvers. When these actions are used however, the player's gathered Soul Gauge energy will deplete. The player will also lose some Soul Surge energy when taking damage.
Sonic and the Secret Rings
, Soul Gauge energy made its debut, where it is just referred to as Sonic and the Secret Rings Soul. In this game, the player can gather Soul from collecting  Pearls, Rich Pearls and defeating enemies. There are also Skills that allow the player to gather or better sustain Soul when certain conditions are met. Other Skills can also improve or assist with gameplay performance at the cost of Soul.
In the battle against
Alf Layla wa-Layla, Darkspine Sonic can generate Soul on his own by shaking the Wii Remote.
Sonic and the Black Knight
, Soul Gauge energy can be gathered from collecting Sonic and the Black Knight red fairies and attacking enemies. There are also Skills that allow the player to gather or better sustain Soul Gauge energy when certain conditions are met. Additionally, there is the "Soul Resurrection" Skill, where Soul Gauge energy is used for health when Rings are gone.
In the battle against the
Dark Queen, Excalibur Sonic can gather Soul Gauge energy by countering the Dark Queen's sword swings.
Sonic and the Black Knight
Main article | Gallery | Script | Staff
Sonic ( Excalibur Sonic) | Caliburn ( Excalibur) | Merlina ( Dark Queen) | King Arthur | King Arthur's horse | Blacksmith | Nimue | Lancelot | Gawain | Percival | Galahad* | Lamorak* | Shadow* | Knuckles* | Blaze* | Amy* | Merlin | King Uther Pendragon | Lady Igraine | Sir Ector | Townsperson
Grand Kingdom Camelot Castle | Shrouded Forest | Knight's Passage | Deep Woods | Dark Hollow
Outlands Misty Lake | Molten Mine | The Cauldron
Highlands Titanic Plain | Crystal Cave | Great Megalith | Dragon's Lair
Avalon Faraway Avalon
Crawling-One | Eyeball-One | Fish-One ( Red, Blue, Yellow, Purple, White) | Flapper | Giant-One | Soldier-One ( Sword, Spear, Axe, Crossbow)
Mist Dragon | King Arthur | Lancelot | Gawain | Percival | Earth Dragon | Dark Queen
Guard | Homing Dash | Jump Dash | Lock-on
Back Step | Grinding | Wall Climb | Wall Shuffle | Wall Slide
Soul Surges Arthur's Soul Surge | Blacksmith's Soul Surge* | Chaos Punishment | Excalibur Sonic's Soul Surge | Flames of Kilekion | Gail Meteor | Galahad's Soul Surge* | Rose Typhoon* | Sonic's Soul Surge
Steel Longsword | Cursed Longsword | Rusty Longsword | Bronze Longsword | Katana | Cursed Dagger | Rusty Dagger | Bronze Dagger | Steel Dagger | Cursed Rapier | Rusty Rapier | Bronze Rapier | Steel Rapier | Cursed Spear | Rusty Spear | Bronze Spear | Steel Spear | Cursed Axe | Rusty Axe | Bronze Axe | Steel Axe
Steel Gauntlet | Cursed Gauntlet | Rusty Gauntlet | Bronze Gauntlet | Cursed Helmet | Rusty Helmet | Bronze Helmet | Steel Helmet | Samurai Helmet
String of Pearls | Mermaid's Tear | Pendant of Eons | Chain Bracelet | Thorn Anklet | Flower Amulet | Wooden Belt | Bright Red Ribbon | Expensive Broach | Rabbit's Tail | Poison Broach | Stone Broach | Ice Broach | Cure-all Broach
Healing Potion | Healing Draught | Antidote | Superior Antidote | Paralysis Cure | Paralysis Immunity | Stone Protection | Petrification Immunity | Vial of Calm | Philter of Tranquility | Fiery Quaff | Hot Fiery Quaff | Herb of Toughness | Herb of Strength
Arthur’s Legend 1 | Arthur’s Legend 2 | Arthur’s Legend 3 | Arthur’s Legend 4 | Arthur’s Legend 5 | Tome of Arms | Tome of Armor | Tome of Medicines | Tome of Amulets | Tome of Games | Tome of Jewels | Tome of Minerals | Tome of Plants | Tome of Feasts | Tome of Rings | Encyclopedia Arcana
Yellow Ring | Green Ring | Red Ring | Blue Ring | Aqua Ring | White Ring | Purple Ring | Poison Ring | Doughnut | Onion Ring
Carnation | Violet | Daffodil | Sweetpea | Lily | Rose | Larkspur | Gladiolus | Morning Glory | Marigold | Daisy | Narcissus | Herb
Garnet | Amethyst | Aquamarine | Diamond | Emerald | Moonstone | Ruby | Peridot | Sapphire | Opal | Topaz | Turquoise
Pawn | Rook | King | Queen | Bishop | Knight | Ace of Spades | Ace of Clubs | Ace of Hearts | Ace of Diamonds | Joker | Medal of Sonic | Medal of Gawain | Medal of Lancelot | Medal of Percival | Dart | Dartboard | Die | Big the Cat Mask | Building Block | Fishing Pole | Doll
Stone | Lump of Iron | Lump of Bronze | Aluminum Ore | Skipping Stone | Rock Salt | Beautiful Crystal | Ice Crystal | Lava Jewel | Flintstone | Mintstone | Gold Ingot | Quasi-Magic Stone | Mithril | Hardtack | Burnt Bread | Moonrock | Wavestone | Dragon-Eye Stone | Orichalcum
Moist Cookie | Tart | Fresh Milk | Spongy Bread | Aromatic Tea | Chilidog | Herb of Calm | Lollipop | Ham
Flag | Ballista Arrowhead | Raven's Feather | Mouse Tail | Oar | Lantern | Broken Trap | Egg | Cheese | Magical Moth Dust | Plant Thorn | Giant Flower Seed | Troll's Eyelash | Broken Lock | Rabbit Fur | Lizard Tail | Prison Key | Iron Shackle | Highland Mushroom | Silk Clothing | Silk Shoe | Dragon Scale | Dragon Claw | Dragon's Fang | Shovel | Pickaxe | Wheelbarrow | Bat's Fang | Broken Brick | Soft-Boiled Egg | Lithograph | Letter
Swords Clarent | Arondight | Rubious | Morglay | Gastiga | Secace | Altachiara | Durendal | Aduro Cutlass | Aduro Khopesh | Precieuse | Espadon | Ddraig Goch | Galatine | Battleaxe | Labrys | Hauteclaire | Gringolet | Balmung | Sanglamore | Chrysaor | Almace | Caledfwlch | Flaming Kopis | Flamberge | Laevatein | Corrougue | Colada | Ktuga | Brinnig | Solais Rapier | Claiomh Solais | Fragarach | Curtana | Ignis Fleuret | Glorious | Joyeuse
Mastery Star | Map | Skill Scroll | Music Notes | Knight’s Seal | Knight’s Banner | Emblem Component | Painting | Deadly Swordsman | Windblade | Destroyer | Quickblade | Blade without Equal | Despised One | Chicken | Weakling | Coward | Ruffian
English voice actors
Jason Griffith ( | Sonic, Shadow, Lancelot, Lamorak) Casey Robertson ( | Caliburn) Melissa Hutchison ( | Merlina) Gavin Hammon ( | Arthur) Amy Palant ( | Blacksmith) Lisa Ortiz ( | Amy, Nimue) Dan Green ( | Gawain, Knuckles) Bella Hudson ( | Percival, Blaze) Pete Capella (
Japanese voice actors
Jun'ichi Kanemaru ( | Sonic) Hiroaki Hirata ( | Caliburn) Mamiko Noto ( | Merlina) Hidekatsu Shibata ( | Arthur) Ryo Hirohashi ( | Blacksmith) Taeko Kawata ( | Amy, Nimue) Kouji Yusa ( | Shadow, Lancelot) Nobutoshi Canna ( | Gawain, Knuckles) Nao Takamori ( | Percival, Blaze) Daisuke Ono ( | Galahad) Daisuke Kishio (
Face to Faith Knight of the Wind | With Me | Fight the Knight | Through the Fire | Live Life
Acts of Chivalry | Apple | Barrier stone | Bat | Battle Mode | Black onyx | Bottomless pits | Breakable Block | Butterfly | Cavalier Style | Chaos Blast | Chaos Control | Chaos Spear | Corner Pole | Dash Panel | Diehard Challenge | Dragon ( Thunder dragon) | Drifting | Explosion Trap | Fairy | Followers | Freeze | Giant spear | Goal Plate | Goal Ring | Grind Rail | Hit | King Arthur and the Knights of the Round Table | Knight Style | Knight's Honor Bonus | Knights of the Round Table | Knights of the Underworld | Legacy Mission | Log | Minecart | Mushroom | Mystery Circle | Paladin Style | Ramp | Reflecting pool | Ring Container | Rich Ring | Ring | Sacred sword | Scabbard of Excalibur | Slime | Skill | Sonic and the Black Knight (manga) | Soul Gauge | Soul Gauge energy | Spiked ball | Spikes | Spring | Title | Treasure Chest | Treasury | Troll | Underworld | Will 'o Wisps | World of Camelot
"*" Appears exclusively in Battle Mode.