Sinspawn Geneaux

Sinspawn Geneaux is the third Sinspawn encountered in Final Fantasy X, left behind after Sin attacks Kilika. It is assisted by two Tentacles which sprout from the ground on either side of the player party. These tentacles will intercept any spells directed at Geneaux and their attacks will inflict poison. Geneaux will initially stay inside his shell and is protected against physical attacks. Once the tentacles are defeated it is quite vulnerable to magic, particularly Fire.

When it's HP drops past 2,400, the shell will open and Geneaux will begin attacking using poison and water-based spells, which can be countered by using Wakka's Silence Attack or Yuna's NulTide spell. Now that it can be hit physically, Tidus and Wakka should be able to finish the battle easily.

Geneaux later returns when his image is used for the Sinspawn Genais during the battle with Sin; and for Catastrophe in the Monster Arena.