Clockwise, from top: "The Fang of Critias", "The Eye of Timaeus" and "The Claw of Hermos", in the artwork of "Legend of Heart"
"Legendary Dragon" (
Despite lacking "Legendary Dragon" in its name, "The Eye of Timaeus" (currently the only "Legendary Dragon" card in the TCG/OCG) includes a name condition that causes it to always be treated as "Legendary Dragon Timaeus".
"Legendary Dragon of White" is not a "Legendary Dragon" card because it does not have 「
|Timaeus||Timaeus||Timaeus of Locri|
Yugi Muto, Joey Wheeler and Seto Kaiba each receive 1 of the 3 Legendary Dragon cards: "The Eye of Timaeus", "The Claw of Hermos" and "The Fang of Critias", respectively. According to Kaiba, the Dragon he received, "Critias", seemed just as powerful as the Egyptian God Cards.
These cards are the dragon forms of the three "Legendary Knights" who used to live in the Dominion of the Beasts and answered Ironheart's call to defend Atlantis. Dartz transformed them into dragons to weaken them. The great ancient war ended in a draw, with the Dragons sealed away in their realm and the Leviathan severely weakened and diminished to a shadow.
Although their names are known prior to their release in the English anime, in the Japanese anime, no one—not even the monsters—knows the names of these dragons except for their chosen Duelists, who learn their name upon releasing them, without even being told what their names are. Thus, they are referred to as the Nameless Dragons in the Japanese anime sometimes even by their chosen Duelists.
In the anime they do not belong to any regular card type; their cards are colored blueish, but not the same as Ritual Monsters. They can be played whilst "Spell Canceller" is on the field, so are not Spell Cards unlike in the TCG/OCG. They are usually played in Monster Card Zones, but Yami Yugi placed "The Eye of Timaeus" in a Spell & Trap Card Zone during his Duel with Weevil Underwood.
"The Eye of Timaeus" can fuse with other monsters to become new Fusion Monsters. Yami Yugi fused this card with "Dark Magician" and "Dark Magician Girl" to form the respective Fusion Monsters: "Amulet Dragon" and "Dark Magician Girl the Dragon Knight".
"The Claw of Hermos" can fuse with other monsters to form new Equip Spells. Joey fused this card with "Time Wizard", "Red-Eyes Black Dragon", "Rocket Warrior" and "Big Bang Blow" to make the respective Equip Spells: "Time Magic Hammer", "Red-Eyes Black Dragon Sword", "Rocket Hermos Cannon" and "Big Bang Dragon Blow". In addition, Yami Yugi also fused "Queen's Knight" with this card to form "Goddess Bow".
"The Fang of Critias" can fuse with Traps to form new Fusion Monsters with effects similar to the Trap Card. Seto Kaiba fused this card with "Crush Card Virus", "Tyrant Wing" and "Mirror Force" to form the respective Fusion Monsters: "Doom Virus Dragon", "Tyrant Burst Dragon" and "Mirror Force Dragon".
"Legend of Heart" allows them to transform into their Legendary Knight forms: "Legendary Knight Timaeus", "Legendary Knight Hermos" and "Legendary Knight Critias". These three Legendary Knights, under the right conditions, can also be combined to form "Timaeus the Knight of Destiny".