World Balance is found in the Adamah Block of Tartarus guarding the 236th floor. It blocks all ailments. In battle, it will actively attempt to target the weaknesses of party members.
The fight proceeds in three "stages." For the first half of its HP, it will stick to elemental Ma-dyne spells. For the following third, it starts to switch to Light/Dark skills, and when low on health it will try to hit a weakness before following up with any offensive magic spell including Megidolaon. If Magic Mirror or Makarakarn is used, the World Balance simply switches to casting Megidolaon every single turn as this would otherwise completely incapacitate the boss. Some find that if they are able to heal enough to keep up with the damage from Megidolaon, its response to a Magic Mirror/Makarakarn would make the fight easier since the player would not need to face the Light/Dark skills.
Another viable strategy against the World Balance is to cast the spell Thunder Reign. This will Shock the boss and leave it open to critical hits from physical attacks and then follow up with an All-Out Attack. This is might bring the World Balance into its Final Phase very quickly, however if the party has no elemental weaknesses that can be exploited then it will switch to using Megidolaon every turn it gets. It is recommended to have a Persona with either Mediarahan or Mediarama combined with Divine Grace to offset the damage from Megidolaon.
The World Balance reappears later in the first section of Judecca within the Abyss of Time as a regular enemy. It maintained the same elemental affinities as its sub-boss variant.
World Balance is faced against as a boss on Heaven's 7th floor. It has a far smaller skill set than its Persona 3 counterpart, having lost its Light, Dark, and Almighty spells. As a result, its tactics are far simpler; it tries to target the party's weaknesses to get extra turns, which it will use to either Dizzy a Downed party member, target another weakness, or cast Mind Charge to boost the power of its next attack. In addition, the boss variant follows a pattern of attacks, alternating Mind Charges with Agidyne, Bufudyne, Ziodyne, then Garudyne in that order.
World Balance appears in the 2nd Block of the Theater District. It attacks with heavy, single-target magic skills, knows Megido, and can use Mind Charge. When defeated, it may drop Balance Cache and Balance Halo. Balance Cache is used to create the Nihil for the P5 hero, the Labyrinth Sword for Junpei and the P4 hero, the Amakuni for the P3 hero, the Rappa for Koromaru and Yosuke, and the Full Jin-Baori male armor. Balance Halo is used to create the Hades Bow for Yukari.