Sinspawn Gui

Sinspawn Gui is the result of the Sinspawn gathered for Operation Mi'ihen fusing together into a giant monster that breaks out of its cage and fights the party in Final Fantasy X, just as Sin approaches the shore. The party is literally scattered by Sin's attack, and Seymour Guado grapples with the reanimated body of Sinspawn Gui alone until he is joined by Yuna and Auron; both encounters count as only one boss for the purposes of rewards.

Strategy
On the turn of the first boss, it will use one of three attacks: Its body may attack by ramming its target, or casting a Gravity spell, or its head may cast Thunder. In addition, failing to attack the head after the message, "The head is moving suspiciously", results in the head casting the Venom poison attack. The arms do not attack, but protect the body against any physical attacks. If and when they are killed, the body can be attacked as normal. The arms will reappear after a few rounds. The head, once killed, will not regenerate.

The second version of the boss is similar, but has half the HP, does not cast Venom and has a separate action each turn for its head while the head is alive.

First Battle
A few party member Overdrives and both Aeon Overdrives will see good use here against all four available targets at once. Tidus casting Haste on himself and then other party members as soon as possible will maximize the ratio between party actions and those of Sinspawn Gui. Auron and Kimahri's attacks are effective against the armored arms, and killing them enables further physical attacks against the body. The arms will regenerate, but count as separate enemies for the purposes of awarding AP; each one killed will add its AP to the total. The first form of the boss gives no loot, so Overkill is not necessary.

Once the head begins moving (if the player has not already killed it), Wakka, and Lulu will be alerted to the danger. If left alone, the head will use Venom on one character, but Lulu's spells, Wakka's attacks, or Lancet will cancel the poison attack, or the poison can be negated by Esuna for the same single action as cancelling the attack, which frees up magic attacks for killing the body.

Second tier spells such as Fira should be strong enough to kill the arms in one shot, or can be used on the body to bypass the arms altogether, or eliminate the head and its poison threat. The rapidly proliferating potential supply of Lv. 1 Key Spheres at this point makes it quite possible for Steal to be accessible on the Sphere Grid, but stealing from Sinspawn Gui will yield only Potions.

Second Battle
For this battle, only Yuna, Auron, and Seymour Guado will be available. Seymour is equipped with the second-level Black Magic spells; he is much more powerful than Lulu or Yuna at this point in the game and can easily defeat the monster on his own. The most common strategy is to have Yuna keep her teammates healthy, while Auron and Seymour attack.

Using Sensor weapons or Scan can ensure that Seymour gets the killing blow with a tier 2 Black Magic. This will result in an automatic Overkill and double the number of Lv. 1 Key Spheres awarded; six rather than three. Waiting for Seymour's Requiem Overdrive to charge will take some time, but this is the only opportunity to see it.

Related Enemies

 * Ultima Buster
 * Sinspawn Ammes
 * Sinspawn Echuilles
 * Sinspawn Geneaux
 * Sinspawn Genais

de:Sin-Schuppe: Ghi Ghi Scaglia Ghy