Ka (
Ka and Ba, spirit and soul, are complementary energies: As Ka are essentially living energy, the manifestation of spirits is strenuous and potentially dangerous to anyone connected with them, although usage of the Millennium Items allows for freer manipulation of Ka and Ba than would otherwise be possible. Also, Ba of either one's own soul or others' souls can be utilized to strengthen Ka and is also necessary to maintain them.
The strength of the Ba determines the strength of the Ka. Furthermore, a person with a good soul will have a good Ka spirit, but a person with an evil soul will have a monstrous or demonic Ka.[1] A Ba that has left the body may also fuse together with a Ka, such as when the Sacred Guardian Mahad fused his Ba with the Ka of Illusion Magician to create Dark Magician. Conversely, it is possible to extract Ka entities, by means of magic, from the bodies of people; although completely draining someone of Ka energy would be lethal, the extraction of a spirit being is nonetheless able to be done non-lethally (with exceptions, as in the case of the extraction of the Ka of Kisara, the blue-eyed woman who embodied a particularly powerful Ka: the Blue-Eyes White Dragon.)
With the Millennium Items, the Sacred Guardians were able to seal the extracted Ka of a person within a stone tablet and could summon and control such tablets from the Shrine of Wedju.[2] Maximillion Pegasus later would discover the ancient Shadow Game and the stone tablets, and then created the game of Duel Monsters in which the cards had similar effects to the tablets. Some of the spirits haven't been released as cards.
Ka List[]
The following are sorted from their card counterparts and those that don't have card counterparts. Additional info on them is also listed.
Ka with card counterparts[]
- The Creator God of Light, Horakhty - It is a fusion of Obelisk the Tormentor, Slifer the Sky Dragon, and The Winged Dragon of Ra. Its card counterpart is The Creator God of Light, Horakhty.
- The Winged Dragon of Ra - Its card counterpart is The Winged Dragon of Ra.
- Slifer the Sky Dragon - Its card counterpart is Slifer the Sky Dragon.
- Obelisk the Tormentor - Its card counterpart is Obelisk the Tormentor.
- Exodia the Forbidden One - Its card counterparts are all five pieces of Exodia.
- Left Arm of the Forbidden One - Its card counterpart is Left Arm of the Forbidden One.
- Right Arm of the Forbidden One - Its card counterpart is Right Arm of the Forbidden One.
- Right Leg of the Forbidden One - Its card counterpart is Right Leg of the Forbidden One.
- Left Leg of the Forbidden One - Its card counterpart is Left Leg of the Forbidden One.
- Curse of Dragon - Its card counterpart is Curse of Dragon.
- Diabound - Its card counterpart is Diabound Kernel.
- Dark Magician Girl - Its card counterpart is Dark Magician Girl.
- Dark Magician - Its card counterpart is Dark Magician.
- Battle Ox - Its card counterpart is Battle Ox.
- White Dragon - Its card counterpart is Blue-Eyes White Dragon
- Mystic Horseman
- Rabid Horseman - It is a fusion of Battle Ox and Mystic Horseman.
- Tragoedia
- Sinister Serpent
- Lord of Zemia
- Fairy Dragon
- Kaiser Dragon - Its card counterpart is Kaiser Dragon. It is a fusion of Winged Dragon, Guardian of the Fortress #1 and Fairy Dragon
- Hercules Beetle
- Illusion Magician - Its card counterpart is Magician of Dark Illusion. It later became one after Mahad's spirit fused with it creating the Dark Magician.
- Winged Sage Falcos
- Winged Dragon, Guardian of the Fortress #1
- Saggi the Dark Clown
- Embodiment of Apophis
- Mystical Elf
- Winged Kuriboh
- Dark Ushebti - Its card counterpart is Charm of Shabti.
- Desert Trapdoor Spider - Its card counterpart is Jirai Gumo.
Ka without card counterparts[]
- Duos
- Duos Dragon - It is a fusion of Duos and Curse of Dragon.
- Galestgoras
- Helimai
- Bastet
- Spiria
- Gadius
- Humanoid Giant
- Zelua
- Two-Headed Jackal Warrior
- Skeleton Fiend
- Illushu
- Gudoul
- Five-Eyed Horned Ogre
- Dark Spirit of Chaos - It was found in an assassin who made an attempt on the Pharaoh's life until his guardians intervened, extracted the monster, and sealed it in a tablet.