Courtesy of PowerPyx for the Video and Description
("72hr Bossfight" in 40 or so minutes)
Note: There is a much faster way of doing this, in "post-post" game. When you've acquired the Zwill Crossblades, Dark Matter Rings for each party member, and enough AP to Max out the Magic tree. This method is quite fast but it requires a ton more grinding and alot of gil to achieve.
Boss Fight Tips:
- Bring lots of Health Potions. Also bring the consumables muscle stimulant (extra damage) and magitek booster (negates MP cost).
- You should be at least level 40. The higher your level the quicker this will go. But your level doesn't matter so much, the boss has very easy attack patterns. I was level 69.
- Buy Ascensions "Warp Factor I" & "Warp Factor II" for more warp-strike damage. You'll be using this technique non-stop in this fight.
- Equip the strongest greatsword you can find. But don't use the Dominator cause the Adamantoise is immune to holy light.
- Cook the meal "Golden Tail Soup" at a campfire and eat it just before heading to the boss. The recipe unlocks when reaching Cooking Level 10. It guarantees critical hits and greatly increases health recovery. This way you won't even have to touch your health potions and deal super massive damage.
- All you gotta do in the fight is keep attacking the Adamantoise's right paw with warp-strike. Use Warp suspension to refill your MP immediately. When the Adamantoise gets knocked out consume the Magitek Booster and Muscle Stimulant and keep attacking the eye (should do 9999 damage with each hit). Just repeat these tactics until it's dead. The adamantoise has 5 million HP.
- When you die you have to start from scratch (even on easy mode! You don't get autorevived on easy during this fight).
*To add on to his description, Warp Strike through the Adamantoise. Don't keep warp striking into the same area you're aiming at but get stuck on one side of tortoise trying to warp strike to the other, this fools the game into thinking you keep doing your first Warp Strike. This keeps the damage multiplier up and your damage around 9999 per hit without attacking the eye.