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Sirius was an unused colossus that was removed from the final version of the game. It was cut "as the way to defeat it just wasn't working out".


Sirius was a relatively small colossus, about the same size as the 11th and 14th colossi (though a little taller than both), resembling a giant boar or hog. Unlike those colossi however, Sirius had relatively little body armor and an exposed back with fur on it. This indicates that its weak spot was constantly exposed during the battle.


Sirius was, also similar to the 11th and 14th colossi, very fast and - possibly - very aggressive. It had to be defeated while riding Agro, as it would chase the player at high speed. Because it had virtually no body armor, the main obstacle of fighting this colossus was not removing it, but simply getting on its back.

The monument needed to defeat Sirius.

The artbook gives a clue about how Sirius had to be defeated, as it says: "rocks meant to be used in the fight with Sirius", with a picture of a stonehenge-like monument. It can be assumed that Sirius would chase Wander while on horseback, and the player had to ride through this monument, making Sirius hit the rocks, causing them to collapse on it. Evidence in the PS3 data sheets reveals that the rocks would break into various pieces, and more than one existed in Sirius' old arena, as you can see a second stonehenge-like structure in the background of a screenshot of it. One of the monuments can still be found in the released version of the game, at quadrant G7.

In the final game, after the 14th colossus' armor is broken, it becomes vulnerable to the various objects throughout the Ruins. It falls unconscious whenever hitting one, getting up after a few seconds, while an animation that originated from Sirius plays where it takes three steps backwards. This could suggest that Sirius fell unconscious the same way as the 14th colossus does, whenever hitting one of the stonehenge rocks.


Sirius was located in the arena known as Stonehenge, most likely located at quadrant "E8". Early pictures of E7[1] and footage of Wander travelling from E6 to E7[2] show a swirling sky and beam that form above a Colossus arena located on top of E8. The chip data of Stonehenge seems to match the early version of quadrant F8 when placed next to it; and its textures match the early version of E7 and F8.

Early theories placed it on G7, with the only proof being the stonehenge structure seen at G7 matching the one used in Sirius' fight as described and shown in the artbook. The chip data of Stonehenge doesn't match G7's however; and in an early picture of G7, the stonehenge structure is nowhere to be seen. G7's unused layer 2 chip data had a model where the stonehenge rock is currently located, suggesting it was moved there temporarely before being implemented in the area's main model. Several other broken stonehenges can also be seen throughout the Forbidden Lands.


  • A texture called "sz_hn_sirius_hifu07_f" is present in the game files, however, it is not listed in the texture parameters for Sirius, only being used on the 15th colossus. After changing the texture's saturation and color, it was discovered that it was indeed the same one used on Sirius's body in the images, just slightly modified.
  • Sirius' name most likely originates from the brighest star in the night sky "Sirius" or "α Canis Majoris", also known colloquially as the "Dog Star".
    • The reason for this name likely relates to the theory which states that the real life Stonehenge has connections with ancient astronomy, particularly H. Broome's 1864 theory, proposing that the monument was built in 997 BC, when the star Sirius would have risen over Stonehenge's Avenue.
  • Several animations of Sirius were found in the E3 Demo build. They are loaded in the 14th colossus' body (one of them is loaded in the 11th), but aren't all performed by them in gameplay. These would later be removed in subsequent versions, only leaving 'sirius_A_back'.
    • sirius_A_add_rasp - It lifts its legs from either left or right sides and then places them down again.
      • It is an "additional (add)" animation, which means it can be played together with another; thus it can be assumed that what is seen in the animation is not all there is to it.
    • sirius_A_back - It walks backwards.
      • This is used by the 11th colossus in order to prepare and ram the altar. The 14th colossus has a faster version of the same animation named "cerberus_A_back".
    • sirius_A_dash - It runs.
    • sirius_A_hit_wall - It hits a wall from either its left or right side.
    • sirius_A_rage - It turns while running doing a 360.
  • Two separate objects related to Sirius exists in the sheets named "siriAacce1" and "siriAacce2" (likely referring to "accessory"). They have the same naming scheme as the rings from the 1st colossus' armor named "minoAacce1" and "minoAacce2".


The Game Shadow of the Colossus ( Demo  · Pal Release  · Shadow of the Colossus HD  · PS4)
Characters Wander  · Agro  · Mono  · Dormin  · Emon
The Colossi I  · II  · III  · IV  · V · VI  · VII  · VIII  · IX  · X  · XI  · XII  · XIII  · XIV  · XV  · XVI
Unused Colossi ( Devil  · Evis  · Griffin  · Phoenix  · Roc  · Saru  · Sirius  · Spider  · Worm  · Yamori A  · Buffalo  · Quetzalcoatl)
Magic Sigil  · Hard Mode
Colossus Arenas Temple  · Proto  · Arena  · Kirin's Hill  · Canyon · Canossa  · Lakeside  · Underground  · Geyser  · Gravewind  · Leo's Cave  · Poseidon's Lake  · Desert  · Ruins  · Parthenon  · Sanctuary
Unused Arenas ( Badlands  · Cave  · Crater  · Devil's Plain  · Dune  · Hillock  · I1  · Labyrinth  · Sluice  · Stonehenge  · Valley )
The Forbidden Lands Shadow creaturesSave shrinesFruit treesWhite-tailed lizards

The Shrine of Worship
Umbral GladeStone Arch GorgeDried MarshNorthern SpanDesert FortressMisty FallsRavine EntranceHalf-moon CanyonWestern PlainRound Stone HillLair to the WestStone Bridge CliffCliff PathLair on the MesaWestern CapeArch Bridge PlainBlasted LandsAutumn ForestEastern BluffValley PlainSouthwestern CapeSouthern PlainGreen CapeThe Broken Seal

Soundtrack Roar of the Earth
Walkthrough Time AttackGolden Coins
Other media Nico  · Official artbook/guidebook  · Collectible figurines  · Film adaptation
Giantology campaign
Hoaxes Jebal-Barez skeletonTamil Nadu tsunami giantSulu Sea eel statuePolarneft conspiracySayre family vacation
Characters Eric BelsonCasper ShillingEd GuylerArkady SimkinBoris AtlasovAndrew and Ellie Sayre
Media Giantology podcasts (FirstInterview with Arkady SimkinThirdFourth) • IPICP memo
SotC Template CoverLogov2.png Walkthrough
Characters Wander  · Mono  · Agro  · Dormin  · Lord Emon  · Guards  · Shadow Creatures
Colossi I  · II  · III  · IV  · V · VI  · VII  · VIII  · IX  · X  · XI  · XII  · XIII  · XIV  · XV  · XVI
Locations The Forbidden Lands  · Shrine of Worship  · Colossus Arenas
Main Items Power-ups (Lizards · Fruit) · Weapons (Ancient Sword · Sword of the Sun · Queen’s Sword · Sword of Dormin · Bow & Arrow · Ancient Bow · Harpoon of Thunder · Life Sword) · Collectibles (Relics)
Gameplay Hard Mode  · Save shrines  · Time Attack  · Reminiscence Mode  · Watermellon  · Barrel
Media Roar of the Earth (OST)  · Official Art and Guide Book  · Nico Bonus DVD  · Film
Releases OPM Demo  · PS2 original  · PS3 remaster  · PS4 remake  · Credits
Early Builds Preview version  · PSU Preview version  · E3 Demo
Unused Content Unused Colossi  · Colossus Test Stages  · Unused Locations  · Beta Mountains  · Shadow of the Colossus Development Phases