Worm (or Dionin, its fan-given nickname) is one of the unused colossi that did not make it into the final release of the game.


According to the artbook, "The flower bulb-like section was its weak point." Besides that, there isn't any other information, making this one of the most mysterious unused colossi.

A Team Ico developer stated that Worm didn't have eyes, and sound was used to distract it.


There's no confirmed quadrant for Worm. An anonymous Team Ico developer stated that it lived on the west side of the map.

The location where Worm is believed to have been located is at quadrants B2 and/or C2. In the Preview and PSU Preview demos, a remnant of a desert-like area bordered with cliffs remains at B2, which is believed to be a small leftover of the colossus' arena, however, a Team Ico developer stated that B2 was an old world border and not the arena of Worm.


  • Unlike the names given by fans to Spider and Phoenix, Dionin is not a Welsh word. The nickname is possibly a tribute to the snake god Dionin from the film The Lair of the White Worm.
  • Looking at a screenshot in the gallery below, it looks like Wander is standing on top of something while being very high up. It can be assumed that he was standing on top of Worm, possibly suggesting it was one of the largest colossi.
  • A Team Ico developer has stated that the Worm would always be halfway inside the sand, so the player would never see its entire body.
  • The same developer has also gone on to state that the Worm was at least larger than Dirge, with no defined size other than that.


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  · Griffin  · Phoenix  · Roc  · Saru  · Sirius  · Spider  · Worm  · Yamori A )
Magic Sigil  · Hard Mode
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 Walkthrough
Characters Wander  · Mono  · Agro  · Dormin  · Lord Emon  · 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
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 Demo  · PS2 original  · PS3 remaster  · PS4 remake  · Credits
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