Uhh... I'm running if you are!Rikku, when entering battle against Ultima Weapon
You're kidding me!Wakka
Ultima will continually cast a variety of status effects on the party: Darkness, Sleep, Silence, Break, and Confuse. The abilities can be reflected back at it, although Ultima Weapon is only vulnerable to Darkness and Silence. Ultima Weapon's normal physical attack hits for around 2,500 HP damage, and as usual for most bosses, will shatter a petrified character.
Core Energy is a magical attack that hits for anywhere between 3,000 and 9,999 HP; Ultima Weapon can also cast Holy, which has similar variation in damage. Ultima Weapon's only group attack is Shimmering Rain, which will hit everyone for about 2,500 damage.
Ultima Weapon is one of only two bosses (Lord Ochu being the other) who can be bribed, and can hand over up to 99 Pendulums if enough money is given. Bribe sums depend on the fiend's HP, and thus because its max HP is higher in the Int/PAL/HD versions, it needs to be given more money to get the full amount than in the original Japanese and North American versions. Soft resetting can be used to attain 99, or the player can bribe for approximately 1,999,980 gil for a good chance for the max amount. The Pendulums can be used to give an armor the ability Master Thief, which makes it easier to steal rare items.
Shell will protect against Core Energy and Holy. Holy can be reflected. Ultima Weapon is vulnerable to Doom. The player can unleash the aeons' Overdrives for good damage, and aeons are immune to status ailments as well. Tidus's Hastega helps as well as any physical attackers having Quick Hit. Doublecasting Flare does a lot of damage with magic users.
- The words "Ultima Weapon" are inscribed in Ultima Weapon's tail in Spiran script.
Ultima means "the last" in Latin and many Latin-based languages. In the Spanish versions of many Final Fantasy games, it is written as "Artema," a close transliteration of the Japanese katakana.