Ultima Weapon: unlocking and beating the post-game superboss

The level, result and post-fight scene are from frames we checked in MELOO's video; the location, unlock steps, HP, suggested level and trophy are PowerPyx's.

Spoiler clip · Ultima Weapon's Battle Result · reveal

Checked on screen · Oct 25, 2026

12:33–12:42 · 9 sUltima Weapon's Battle Result

Square Enix's Vol. 4 update says Ultima Weapon waits at journey's end and calls for perfect preparation. PowerPyx's trophy guide fills in the rest: it can be fought as soon as the story is finished, and reloading the cleared save plays a short airship scene about a new presence in Ardra Crater, in the south-east of the world map, where Ultima Weapon stands and can be fought by interacting with it.

らんぷ's video shows that scene: just after a Chapter 8 HUD, Evan and Sakura on the airship bridge report that the radar has picked up an unidentified object, apparently on the Ardra continent (our gloss of the Japanese 'アードラ大陸'). Both videos then show Ultima Weapon in a dark place before the battle, speaking in MELOO's. Neither shows the world map or a location card in the frames we checked, so the crater's name and position are PowerPyx's.

1. Finish the story.
2. Reload the cleared save and watch the short airship scene about a new presence.
   Spoiler clip · Post-story airship scene: an unidentified object · reveal

   Checked on screen · Oct 25, 2026

   0:22–0:44 · 22 sPost-story airship scene: an unidentified object

   0:22–0:44Spoiler clip
3. Go to Ardra Crater in the south-east of the world map and interact with Ultima Weapon (PowerPyx).
   Spoiler clip · Ultima Weapon's speech before the fight · reveal

   Checked on screen · Oct 26, 2026

   kingy.wiki0:02–0:20 · 18 sUltima Weapon's speech before the fight

   0:02–0:20Spoiler clip

MELOO's info card reads 'Ultima Weapon' at Lv.70, with all four affinity icons still marked '?', so it doesn't show weaknesses. PowerPyx gives it 3.9 million HP. MELOO's fight runs from 0:24 until the Battle Result at about 12:33 of their video, with Rain, Lasswell, Fina and Archwitch Fina; the Growth screen afterwards shows all four at Lv.99.

PowerPyx says it can be beaten at Lv.60, suggests 60–65 as a minimum and recommends leaving it until last, when you have your best gear and more Visions maxed. Its tips: Ultima Beam, the strongest attack, is flagged by an exclamation mark on the turn bar and red flames above the HP bar, and the boss inflicts several status ailments. The author's magic-based party opened with Reraise on everyone, alternated curing with Shellga on the party, used Dispel when Ultima Weapon buffed itself with Bravery, guarded against status ailments, and saved a damage-nullifying Limit Break (Sakura's Eternal Veil, in PowerPyx's wording) for each Ultima Beam.

1. Protect the party against status ailments before you go in.
2. Open with Reraise on the party, as PowerPyx's setup does.
3. Watch the turn bar: when Ultima Beam is flagged, protect the party before it lands.

MELOO's Battle Result shows 600,000 EXP, 2,500,000 gil and a Megalixir; MRP Gained rises from 2,000 to 2,600 as a 600 Stagger Finish Bonus is added. The party's gil total in the corner rises by the same 2,500,000, and the Growth screen that follows lists all eight characters at Lv.99, with MR 9 on the four who fought. PowerPyx says the win earns the trophy 'My Name Is Ultima…' and an Ultima Reactor accessory; neither appears in the frames we checked, so we can't say whether the accessory is a first-clear reward.

Then Rain and Archwitch Fina talk on a rocky plain. She explains that Ultima Weapon was a weapon that vanished when it was activated and somehow 'made its way to Lapis', and the two talk about how strong Rain has become. MELOO's title calls this the secret ending; in their video no credits or title card follow before it ends, and らんぷ's video also shows Archwitch Fina and Rain talking after the fight.