Altogether, Vincent has four different limit breaks. Each one of them has a different effect, but all of them transform him into an unusual, monstrous form. While Vincent is under his limit break, he becomes uncontrollable, which could be a bad thing if your other two party members are dead. =/
Level 1 - Galian Beast
Acquiring
This is Vincent's default limit break
Status Changes
HP, Dexterity, and Defense % increase.
Attacks
Berserk Dance: Galian swipes his claws at an enemy 4 times.
Beast Flare: Blasts balls of fire at all enemies.
Level 2 - Death Gigas
Acquiring
Vincent delivers the finishing blow to 42 enemies
Status Changes
HP & Defense increase. Dexterity & Magic Defense decrease.
Attacks
Giga Dunk: One heavy blow on an enemy.
Live Wire: Unleashes electricity at all enemies.
Level 3 - Hellmasker
Acquiring
Vincent delivers the finishing blow to 54 more enemies
Status Changes
Defense increases.
Attacks
Splattercombo: Chainsaws an enemy 5 times.
Nightmare: Casts confusion, mini, toad, sleep, poison, and silence on an opponent.