The swords stand like trees in a forest. It's not just ten or twenty. Not a hundred or two hundred. No matter how many there are, if it is impossible for them to be counted, they might as well be infinite.
The tools are rusting without anybody to use them. A ruin of infinite swords. [...] It is like a graveyard.
The field of blades seems to be the representation of Endless Struggle and Utter War. It's a desert with swords sticking in the ground by their blades. The battle seems eternal for whoever walks it.
It's most likely a graveyard for warriors with swords standing in for proper headstones.
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Anime and Manga
In Berserk, Rickert creates one of these as a memorial for the Band of the Hawk, personally forging a sword for each of the fallen. Ironically, it is on this hill that Guts encounters Griffith, the bastard who sacrificed and betrayed the Hawks, reincarnated as a human again for the first time since the Eclipse.
We see Ichigo sitting in the field of blades in the Opening Sequence during the Soul Society Arc of Bleach. Small wonder; he has an endless battle ahead of him, having decided to take on the entire afterlife for the soul of a friend. We also see the field during his inner struggle to awaken his powers and those of his sword.
During his less-inner struggle to awaken his Super Mode, Ichigo's mentor forces him to search for his real sword in a literal field of fake ones. While being assaulted by the very sword's spirit.
The anime adaptation of Campione! gives Godou the ability to do this.
In High School Dx D, Issei used his newfound power "Boosted Gear Gift" onto Kiba's "Sword Birth" to initiate this effect during the Rating Game with Raiser Phenex, taking out 5 of the 6 combatants in the area.
In Katanagatari, this is how Meisai uses her Tsurugi, attaching each of the thousand swords to a tree. Then it's averted when Shichika just runs out of the forest.
Variation: In the 1st ending of the second season of Mobile Suit Gundam 00, Setsuna F. Seiei is seen standing in the middle of a field of guns standing barrel down in the ground, all of which are covered with roses.
Variation: The third intro of Naruto suggests the trope with a field of kunai.
Sayaka can also spawn small fields of swords so she can quickly pick them up and throw them, butHomura one ups◊ them both. Is it any surprise that part of the development team worked on Fate/Zero?
Rave Master had a battlefield made into a memorial by turning it into a field of blades.
The Rurouni Kenshin manga spoofs this trope a bit. When a government official is targeted for assassination, he hires various swordsmen to protect him — but at the same time, he insults and belittles their skill and brags about how he stood against "the field of blades and the storm of arrows" during the Meiji Revolution. Just then, Kenshin walks in, politely remarking that he has not seen the official since Kenshin CARRIED him through "the field of blades and the storm of arrows," as the official was too busy cowering in fear at the time to lend a hand. This promptly shuts the official up.
Played in a more serious manner whenever Kenshin's history as Battousai shows up: in the beginning of the manga, in the end of the Tsuiokuhen OVA, and in the upcoming live-action film, katanas are planted amidst the bodies of the fallen combatants.
In Samurai 7, during the first battle with the bandits, the experienced leader sticks numerous swords into the ground in case someone's happened to break, as he wants them to fight to the fullest.
A variation in Smile Pretty Cure!. Reika/Cure Beauty is capable of freezing an entire area into ice, and some sharp ice blocks exist. These sharp ice blocks serve as her blades which she can pick up anytime and in case one breaks, she'll just pick up another.
In Tengen Toppa Gurren Lagann, in the burial place of Kamina his sword is sticking out of the ground by the blade, his cape tied to its handle. In the Distant Finale, after the death in space of most of the Dai Gurren Brigade, several other swords stand alongside that one, as well as a needle standing for Nia.
Reduced to two and Nia's sword needle at the end of Lagann-hen since most of the cast killed in the series were spared.
In the manga adaptation of Yu-Gi-Oh! 5Ds, Yusei has a card called 'Warrior's Pride', which depicts one of these in its artwork, with Shield Warrior (a card he uses in the anime adaptation) leaping out of the ground at the field's centre.
In Lucifer, the entrance to the home of Lilith is marked by a Rain of Swords, which is symbolic of what she perceives as her struggle against the God who exiled her from the Garden of Eden and his Angels who exploited and waged war on her children.
In Planetary, the Big Bads have this trope in the form of an Alternate Universe. It's a featureless plane of floating weapons, but upon closer inspection the floor is made of the bones of the world's former inhabitants. (They killed an entire world just so they'd have somewhere to keep their swords).
In chapter 4 of the My Little Pony: Friendship Is Magic fanfic The Ballad of Twilight Sparkle, Rarity uses her illusion magic to conjure one of these while trying to pass off the weapons she confiscated from the Cutie Mark Crusaders (who were assaulting Spike in a poorly thought-out attempt to get dragon-slaying cutie marks) as a new fashion statement, "Shield-Maiden Chic".
13 Assassins features Hirayama fighting in a courtyard with dozens of swords planted there in advance. He still manages to run out.
The film The Prophecy has a fairly bizarre variation, wherein the endless field of blades is in fact an endless field of wooden stakes, on which fallen angels are impaled.
Kurosawa's Seven Samurai, where Kikuchiyo explains that he needs a lot of swords to kill a lot of people. Also, the four graves of the dead samurai have swords sticking out of them.
The third book in Conn Iggulden's Emperor series is called The Field of Swords.
This also happens in Brandon Sanderson's The Way of Kings when we flashback to the Radiants abandoning humanity and leaving their Shardblades in the ground. It takes all of twenty seconds before bystanders start picking them up.
Live Action TV
The promotional video for season 2 of Heroes released at the end of August 2007 shows Hiro amidst a field of katanas.
Morgana has a vision of this as her and Arthur's final end in Merlin
As of the Dawn Solution, Solars in Exalted have an Unlimited Blade Works-style Charm: Thousand Arms Prana. This upgrade to Summoning the Loyal Steel allows the Solar to store as many weapons Elsewhere as he pleases, at a cost of one committed mote per (Essencex2) weapons. Decommitting this cost causes all of the weapons to embed themselves in the scenery around the Exalt, intangible to anyone but him until he picks them up and starts using them. The full text of the Charm (as well as a link to the Ink Monkey article it originated from) can be found here.
BIONICLE has the Forest of Blades on Bara Magna, where the remains of warriors still holding their swords and weapons are fused to the trees themselves, by the powers of the Element Lord of Jungle they were fighting.
The grave of the Abysswalker Knight Artorias in Dark Souls. It's an open field of grass and flowers, the middle of which holds his very large greatsword, which is surrounded by many other swords and gravestones. It doesn't look guarded... at first.
The Infinite Graves attack from Disgaea 3: Absence of Justice is also likely a Fate/stay night reference. It warps the user and the target to a field of blades, where the former proceeds to take them one by one and slash the target at lightning speed.
In Ninja Blade, the final boss-fight takes place in a field of blades. However it stays still during the fighting, the swords get thrown around during cutscenes.
In Ninja Gaiden II's trailer, Ryu Hayabusa is found holding both one of the Falcon's Talons claw weapons and the Eclipse Scythe while walking through a field of blades. You actually get to fight in this field of blades, though no serious battles occur. After killing Genshin, the rival ninja gives Ryu his cursed sword: The Blade of the Archfiend. After the credits roll, Ryu is seen praying for Genshin's soul in front of this very blade, stuck into the ground alongside the other blades. He then turns and leaves it there, a memorial for his defeated rival.
Tangentially related, a trap in Tomb Raider (original and remake). One of the puzzles, concerning the Sword of Damocles, has Lara making her way through a room where any step could bring a deadly sword down on her head.
Warhammer Online has an area in the Chaos Wastes that is a battlefield covered as far as the eye (or graphics card) can see with weapons, armour (usually staked into the ground on spears) and... this being Warhammer, after all, frozen corpses buried up to their waist.
Way of the Samurai lets the player create one of these in the third installment. Taking a mission to stop a feud or clear your name by killing off a hundred enemies eventually causes a mass of weapons plunged into the ground blade-first by fallen enemies.
In Yggdra Union, units not killed in the initial charge drop their weapons when defeated, firmly planting them in the ground. Close battles can end up with two leaders duking it out on a field of blades made of the weapons their respective units used, which ends up moderately amusing when witches fight on a Field of Brooms.
In one path of the Visual Novel, Shirou also unlocks his own version of Unlimited Blade Works. The Magical Incantation used to invoke it is slightly different from Archer's, showing Shirou's optimism and self-sacrifice compared to Archer's cynicism.
The Dragons' Graveyard, in the Dungeons & Dragons episode of the same name, is Exactly What It Says on the Tin, an extradimensional dragon graveyard presided over by Tiamat. Apart from being full of creepy dragon skeletons, its most notable feature is being up to its armpits in abandoned magic weapons.
A historical example, and possibly the Trope Maker: the shogun, Ashikaga Yoshiteru was known for his skill with the katana. On 1565, when his small force was attacked by a large coalition Miyoshi force, Yoshiteru knew he was more or less screwed but determined to go down fighting. Bringing out numerous katana (Some sources say a dozen, some others say around a score or so), he plunged them into the floorboards of his castle and killed a large number of enemy troops on his own throwing aside priceless katana that broke down as their blades became notched. However, with no help arriving from daimyo that would have supported him in time, the few troops under Yoshiteru and eventually, Yoshiteru himself were overrun. This may have inspired Archer's Unlimited Blade Works, as his chant suspiciously sounds like a piece of poetry from the same man.
There are thousands of pictures from both World Wars and the Korean War (sometimes Vietnam War or Iraq memorials) that depict rows upon rows of rifles jabbed into the ground with the bayonet and a helmet on top.
Dog-tags or boots are sometimes hung on the bayonet as well.
Vlad the Impaler uses a different version. A field of lances with bodies impaled on them. Said to have discouraged an invading army from attacking his territory.