What is a Limit Break?

Limit Break
Unit shards and vision spheres can be used to Limit Break a unit. Limit Breaking can raise a unit's max Lv., max Job Lv., and unlock equipment item slots.

1st Limit Break: Raises unit's max Lv., max Job Lv.
2nd Limit Break: Raises unit's max Lv., unlocks second equipment item slot
3rd Limit Break: Raises unit's max Lv., max Job Lv.
4th Limit Break: Raises unit's max Lv., unlocks third equipment item slot
5th Limit Break: Raises unit's max Lv., max Job Lv.