Juggernaut is a special enemy in Final Fantasy X, created in the Species Conquest of the Monster Arena after five of each Ruminant-type fiend has been captured. It is an imposing beast with four horns sprouting from its back, sharing the same model as the Grendel. It can be farmed for Strength Spheres for min-maxing.
With high Strength, Defense, and magical immunity, Juggernaut can be tough to defeat. Being an armored creature possessing a high resistance to Armor Break means that without the Piercing ability, weapons will have little effect.
Its normal attack can inflict heavy damage, while Crush Spike is an Instant Kill. Like the lesser fiends from this species, Juggernaut will often release a Salvo, a fireball, on the entire party. This move requires one round of charging, which gives time to cast NulBlaze or switch to an appropriate armor.
Juggernaut opens the battle preparing to use Salvo. Afterward, it will use a physical attack or Crush Spike until it has used Crush Spike four times, eventually repeating the process. Against aeons, it will use its basic physical attack.
Juggernaut is a key to the stat maxing process, as it drops Strength Spheres 87% of the time. Juggernaut drops weapons with Strength +% abilities and armor with Defense +% abilities, Strength +20% and Defense +20% being fixed abilities.
Since both the regular attack and Crush Spike are physical attacks, one character could use Sentinel to receive them in place of other characters. This character will need Protect to help survive the damage and armor with Deathproof to withstand the instant kill of Crush Spike. Alternatively, if another character has Auto-Phoenix on their armor, it's possible to just let the Sentinel die to Crush Spike and then revive them.
While Juggernaut is not immune to Armor Break, it will only work 5% of the time. A Frag Grenade or Auron's Banishing Blade Overdrive work 100% of the time, and so are more effective to break its Full Break resistance.
Juggernaut is an English word that refers to "a huge, powerful, and overwhelming force or institution." It is derived from the Sanskrit word Jagannātha, which means "lord of the universe."