Humbaba also known as Phunbaba, is one of the villains and bosses of Final Fantasy 6 fought in the World of Ruin.
He's one of many monsters released when Kefka caused the end of the world, along with the 8 legendary dragons and Deathgaze. The player battles the beast 4 times, although only 2 of the fights can be won. Each time the monster uses a different Al script. He is battled in Mobliz.
Humbaba is first fought alone by Terra when the player first visits Mobliz in the World of Ruin. Humbaba is invincible and cannot be killed. As Terra is unequipped, the player must choose to let her be knocked out. Even if the player uses the Vanish-Doom bug on Humbaba, it will be treated as a loss. After Terra falls, the player's party battles Humbaba in a normal battle. Humbaba flees upon being defeated, leaving the Fenrir magicite. Though many players choose to travel to Mobliz after recruiting Sabin, they may leave the visit for later in the game.
When the player returns to Mobliz after acquiring the Falcon and locates Terra, Humbaba will arrive for a third battle. When his HP is depleted he uses Humbaba Breath to remove two random party members from battle, and the battle ends. At this point Terra arrives and assists the player in the fourth and final clash with Humbaba. During the fourth battle Terra is in Trance the entire battle and will therefore do great damage. Once Humbaba is defeated the fourth time, he is killed, and Terra rejoins the party.
Though he has four different AI scripts for each fight, Humbaba is offensively the same enemy every battle - it is only his AI script for the end of the battle that changes, his attack script and stats remaining identical. The sole exception is during the second battle where Humbaba's HP increases to 28,000. He attacks with Thundara, Thundaga, his special attack Solar Plex, and 1000 Needles.