Attacks with lightning-elemental attacks. If it has both arms, it can deliver a Delta Hit.
When the boss and both of its arms are alive together, they cast Delta Attack, which inflicts Petrify on one target and cannot miss, barring immunity. On its own Inferno uses Thundaga, Gigavolt, Atomic Rays, and Shockwave. It counters with its special attack, Sobat, doing heavy physical damage. When alone Inferno will use Magitek Barrier to give itself Protect and Reflect.
Inferno is weak to Lightning, so the party's own Thundaga spells work well against it. The player can equip Reflect Rings to bounce the Inferno's Thundaga spells back at it to damage it, but if they do so they are advised to have Strago or Mog in the party to bypass Reflect and heal the party with Dance or Lore, as Inferno's other attacks can be quite dangerous. Inferno is immune to Invisible, so the quick-kill Vanish-Death combo is useless.
1st Turn: Thundara (33%) or Atomic Rays (66%)
2nd Turn: Gigavolt (66%) or Atomic Rays (33%)
3rd Turn: Thundara (33%) or Atomic Rays (33%) or Shockwave (33%)
4th Turn: Thundara (33%) or Atomic Rays (33%) or Shockwave (33%)
If attacked by anything: Sobat (33%)
If Inferno is by itself (this is only done once per battle):
- If Inferno does NOT have Haste status:
- Target: Self
- Magitek Barrier (100%)
If Inferno and either Ketu or Rahu are alive: Thundaga (66%) or Meteor (33%)
If Timer >= 30:
- If Inferno, Ketu, and Rahu are alive:
- Delta Attack (100%)
- Set Timer = 0