Besides typical English translation and localization, the English version of Kingdom Hearts II differs from the original Japanese version in the content of gameplay and several scenes:
When Sora battles the Hydra in Olympus Coliseum, green blood gushes out whenever Sora harms it. The green blood was changed to black and purple smoke in the English version, though the cutscene where Hercules was fighting it retains the green blood. The reason for this change is unknown, as even the original movie had the green blood. Xigbar's telescopic sight was changed from view with a crosshair and black...
If you'd like to have any shot at winning this battle, make sure you have every magic enhancing ability equipped, such as all your MP Rages and MP Haste. segundo Chance is also mandatory. Ars Arcanum is also nice to have. Also, be sure to have Aero and Cure mapped to quick spell buttons. The third won't matter since you won't need it.
In your items slot, carry nothing but elixirs or megalixirs, whichever you have.
PHASE I- Lifebars 1+2
Sephiroth has 6 life bars. 5 normal ones, and one "invisible" one that you must get rid of before his damage meter starts...
1. Throwing a water bottle in the air will cure you of any injuries. 2. Heartless have no hearts 3. Axel wants you to memorize everything 4. If there is a big storm outside, just stay in the house and forget the boats 5. Skateboards can be found in the most bizarre of places. Word on the kalye has it that Hades even keeps one outside his personal chamber. 6. Sora, Donald, and Goofy will always be reffered to in that order. Always. 7. Ice cream doesn't melt in pockets 8. Hoods do not mess up hair 9. A wooden stick makes a great sword… until you have to use it. 10. I can Fly