Final Fantasy Series Boss Battles

The Final Fantasy Series Boss Battles often abbreviated as "FF Series Boss Battles" or simply "SBB" is a feature and sub-series of Trials in Final Fantasy Brave Exvius.

Gameplay
As the name implies, players face the final bosses of previous Final Fantasy installments (mostly from the main series), in difficult trial battles.

While facing a particular Boss, all units from the same game as that Boss gain a stat bonus during that battle only. That is to say units that hail from Final Fantasy such as Warrior of Light or Garland, will gain a boost when facing Chaos. The same is true for units from Final Fantasy II while facing Emperor Mateus, and so forth.

Rewards for defeating the Boss, include a set of special abilities unlocked for all units from the respective game, no matter their rarity. This also extends to newly released units. In the case of those for Brave Exvius itself, the abilities are unlocked only for the main characters of the game, excluding certain variants.

Version Differences
There are a few differences between the Japanese Version and the Global Version. In the latter, the feature is to be introduced respectively sooner than the Japanese version. The order of the Bosses is also different, and according to developers the rewards will also be different. The Special Ability unlock prize is replaced with a new mechanic called Latent Abilities in which players can unlock the same abilities by venturing in a certain dungeon. Developers state this change was done so that players could access these abilities before facing the Bosses.