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 the party members. It is also capable of negating the Magic Mirror and Makarakarn skills (which would otherwise be excellent strategies for the fight).
The fight goes in three "stages." For the first third of its HP, it will stick to elemental -dyne spells. For the following third it starts to switch to the Light/Dark skills, and when low on health it will try to hit a weakness before following up with Megidolaon. If a Magic Mirror or Makarakarn skill is used, the World Balance simply switches to casting Megidolaon every single turn. 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 physical attacks and then follow up with an All-Out Attack. However, the World Balance will switch to using Megidolaon every turn it gets after this is done. It is recommended to have a Persona with Mediarahan or a Persona with Mediarama and Divine Grace to offset the damage from Megidolaon.
World Balance is first encountered as a normal enemy on B5F and B6F of the Secret Laboratory. This variant will constantly attempt to target the protagonist with Ziodyne spells. This will happen even if the protagonist nullifies or reflectsElectric attacks. If Yosuke Hanamura is in the party, he may occasionally be targeted. Upon defeat, World Balance may drop Shining Dish. Selling six Shining Dishes at Daidara unlocks the Fearful Kunai weapon for Yosuke.
World Balance is faced again 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.
In Golden, the normal enemy will use Hamaon and Mudoon instead of Ziodyne. It may also drop Buffalo Stone.