The guidebook gives information on how Phoenix had to be defeated: "Its body was wreathed in flame. You defeated it by plunging it into a lake". This indicates that Wander was not able to climb its body straight away. In all released screenshots of Phoenix, Wander is seen riding Agro, so it can be assumed she was vital to this battle.
According to an old Team Ico Gamers Blog post, Phoenix was removed for being overpowered and also because it required a huge arena due to its attacks.  (This would later be confirmed by an interview with Fumito Ueda conducted by French gaming magazine Chronic'art.)
There are two proposed locations for this colossus' original location; the first at Quadrant D3 (Basaran's lair from the retail version), where the same trees seen in several of the Phoenix beta screenshots can still be found. The second is at Quadrant I4; where matching texture and data evidence also suggests the colossus once dwelled. In the PSU Preview Version, the file names of the Phoenix's trees at Quadrant D3 all contain the 'I4' string (this was removed by the Preview Version.); the presence of which indicated the trees likely once existed behind Avion's arena at the I4 Quadrant. This, along with the newly-realized explanation for Avion's displaced boss_icon at Basaran's arena in the OPM Demo now leaves D3 as the more unlikely location for the Phoenix's location.
|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|