No Face May King: Faceless King (顔のない王, Kao no nai Ō?), called Faceless King (顔のない王, Kao no nai Ō?) in Fate/Extra, is Robin Hood's hidden Noble Phantasm, magic clothing that erases any sign of the wearer. Robin Hood is an incarnation of nature, introduced and inherited as a custom of the Celts from the Beltane Festival where participants pray to the forest spirit Jack in the green for the arrival of spring after the establishment of the "May Festival". The festival involves making a circle and dancing around a pillar built in the center of the village square where a boy and girl on the cusp of adulthood would impersonate the "May King" and the "May Queen". The "May King" is a metaphor for Robin Hood, a "transparent king" who added brown accents to his green clothing so that his figure would not be seen.
During the festival, the "May King" magic costume of green skin is just clothing with ordinary brown accents. With both the leaves and brown stems of the costume, Robin Hood is definitely the incarnation of nature. Donning the May King costume erases any sign, so those wearing it naturally melt into that appearance. With it, he holds the same level of ability as the Fairy Puck. It is said to be stronger than the Bow of Prayer on the back of his hand as a "one-sided victory cheat item". It allows him to disable the reading of one another in battle, allowing him to win all attack exchanges that turn in-game.
It does not hide magical energy, but it does completely conceal the wearer's sound and scent. It allows for him to utilize his sniping abilities and exhibit Assassin-like behavior while hiding himself in the cloak. If he begins to attack, his targets can sense that he is following them, but are unable to actually detect his location. Such tactics aggravate his chivalrous Master, Dan Blackmore, so it is strictly forbidden outside of combat. It can be given to another, such as Passionlip in order to conceal the File Folders, but she fails to use it properly. She breaks it while attempting to use it as a ribbon due to finding its green color to be pretty, citing how fragile it was for her.
 Fate/EXTRA material - Encyclopedia: Faceless King [Noble Phantasm], p.201
Faceless King [Noble Phantasm]
No Face May King. Green Archer's hidden Noble Phantasm.
Robin Hood is an incarnation of nature, introduced and inherited as a custom of the Celts from the (Spring Festival) Beltane Festival after the establishment of the "May Festival."
In this festival, they make a circle and dance around a pillar built in the center of the village square where a boy who is almost a man impersonates the "May King" and a girl who is almost a woman impersonates the "May Queen."
This "May King" is a metaphor for Robin Hood. At this festival, the May King magic costume of green skin is just clothing with ordinary brown accents. Needless to say, with these leaves and brown stems (Green Man), Robin Hood is definitely the incarnation of nature.
Wearing the May King costume erases any sign, so that those who wear it naturally melt into that appearance.
With this, Robin Hood holds the same level of ability as the Fairy Puck.
Said to be stronger than the Bow of Prayer on the back of Green Archer's hand. Disables the reading of each other in battle, a one-sided victory cheat item.
Robin is a sniper who hides his figure in this cloak, appearing with Assassin-like behavior. Because it aggravates the Master, Dan, the use of "Faceless King" was forbidden outside of combat.
Even in CCC, where it saw a surprising usage, its results were disappointing in Passionlip's hands.