By the third dungeon, you can fuse Personas with "Null" passives and Boost skills. This is where start to specialize.

A well-crafted Persona build can greatly impact your progress in the game, allowing you to tackle tough enemies, overcome obstacles, and explore the vast dungeon system. Conversely, a poorly constructed build can lead to frustration and stagnation.

Once you unlock fusion accidents and ultimate Personas (level 80+), you can break the game in half.