Seymour (Final Fantasy X boss)

Seymour is fought several times in Final Fantasy X. He is battled in several forms: his original form, Seymour Natus, Seymour Omnis, and Seymour Flux.

The first battle with Seymour occurs shortly after Yuna receives her fourth Aeon at Macalania Temple. Tidus and the other Guardians had discovered Seymour's treachery in murdering his father and attempted to stop him.

Strategy
At the start of the battle, Yuna, Tidus, and Wakka can talk to Seymour using the Trigger Commands. Doing this will raise Tidus' Strength and Yuna and Wakka's Magic Defense. Seymour is flanked by two of his Guado Guardians, their first action is to cast Protect on themselves, while Seymour casts Shell on himself, which is a rather dastardly trick. The Guards will cover Seymour from physical attacks, and you will not inflict much damage on them with physical attacks since they have Protect. They cannot cover magic, but then Seymour has Shell on him. Using Ixion's Aerospark might counteract this. The Guards will use Hi-Potions whenever they are hit with a physical attack, using Rikku to Steal these will prevent this action. They will also throw Confuse-inducing Shremedies at the party. Also, Stone Breath from Kimahri will kill them instantly.

Seymour will cast spells at the active party in the following order: Blizzard, Thunder, Water, and Fire. Using Yuna's Nul spells will help negate any damage.

After his HP drops to 3,000, Seymour will summon his Aeon, Anima.

After Anima is defeated, Seymour will have returned to full health and his Magic power will be raised. Using Auron's Magic Break will reduce the effect of the spells slightly. Seymour will now vary his spells and will also cast twice in one turn, however by using the Nul spells and attacking with the two best fighters, the battle is sure to end in the party's favor.

Strangely, Seymour's Requiem Overdrive, which he had as a playable character in the battle against Sinspawn Gui, is not used by Seymour, nor is it implied that he ever had access to it.

Final Fantasy X

 * Anima
 * Guado Guardian
 * Seymour Natus
 * Seymour Flux
 * Seymour Omnis

Final Fantasy X-2

 * Auron
 * Kimahri
 * Lulu
 * Tidus