Soul Break

Soul Breaks, referred as Soul Strikes in the database and often abbreviated as SB by players, are special abilities in Final Fantasy Record Keeper. Soul Breaks are similar to the Limit Break system found in previous installments in the series.

Overview
Each playable character has a Soul Break, which is sometimes unique to specific characters or usable by multiple characters. All characters start with a Soul Break but are able to use other Soul Breaks by equipping specific pieces of equipment, such as a weapon.

History
Initially, players were forced to pick only one Soul Break for their characters before they were brought into battle. The game later allowed for characters to choose 4 different Soul Breaks to bring into battle. Character-specific Soul Breaks, also known as Unique Soul Breaks, could also be mastered by the character, thus allowing them to use Unique Soul Breaks without having to wear the equipment that originally granted it.

Non-augmenting types
These are the moves initially equipped on a unit. Many are either slightly amplified versions of a normal attack for the user, or buff/debuff skills.
 * Default Soul Breaks

Certain weapons and armor of rarity rank 5 may contain Shared Soul Breaks. These can be equipped on any unit regardless of origin or synergy status. Most shared SBs are amplified attacks or area-of-effect (AoE) abilities impacting groups. They can be equipped at will, but not mastered.
 * Shared Soul Breaks

Unique Soul Breaks are moves specific to a given unit, but which do not grant any boost upon mastery. Many Unique Soul Breaks are based on their users' signature skills from their worlds of origin. A few of these moves are taught with rarity rank 4 weapons and armor, but such cases are limited to the core classes. Most other Soul Breaks require rarity 5 items.
 * Unique Soul Breaks

Augmenting types
More powerful versions of Soul Breaks have been introduced as well. These advanced moves are supercharged to provide increased damage, healing, or status-altering effects. Each Soul Break in this group permanently augments a character's strongest stat when mastered. Consequently, each requires more EXP to master than a Unique Soul Break does.

Super Soul Breaks, or SSBs for short, are not unlike unique Soul Breaks in that they are specific to one character. All Super Soul Breaks are indicated by a Plus ("+") badge on the bottom right corner of their button icons. They are assigned to rarity rank 5 weapons and armor.
 * Super Soul Breaks

Ultra Soul Breaks are essentially next-level SSBs that provide greater effects when used. All Ultra SBs are identified with a pair of plus signs ("+ + ") as the badge over their button icons. They are found on Relics of rarity rank 5 or higher. This upgrade was introduced with the Vow Upon a Star event.
 * Ultra Soul Breaks

Burst Soul Breaks, or BSBs for short, are stronger than Super Soul Breaks in that they also grant the user with Burst Mode status, which replace the "Attack" and "Defend" ability with unique abilities for a fixed duration. If used as a Roaming Warrior, the effects of Burst Mode are granted to the summoning character as well. All Burst Soul Breaks are indicated by a small flame badge on the bottom right corner of their button icons. They are assigned to rarity rank 5 weapons and armor.
 * Burst Soul Breaks

Chain Soul Breaks are designed to allow for concurrent multiple-hit combination attacks that can be shared among members of the party, in turn increasing the damage-per-second ratio the longer an attack chain remains unbroken. The unit possessing such a Soul Break opens the chain, while other units can contribute using elemental skills matching the element of the Soul Break in play to extend the chain. Certain units can also use special ability classes (e.g. Witch skills) to help extend the chain. Chain Soul Breaks carry a linked chain badge on their button icons.
 * Chain Soul Breaks

Overstrike Soul Breaks, or OSBs for short, are powerful moves that break the damage limit, extending the cap to 99,999 points, but are always single-hit abilities, even though the animation may indicate otherwise. OSBs are indicated by an arrow badge on their button icons. They are assigned to rarity rank 6 weapons and armor.
 * Overstrike Soul Breaks