Special abilities are simply custom skills that can be used in the game. They don't have a particular category type (i.e. Unison Ability). The user of these skills range from party members to enemies that you come across in the world.
Aramus
:: Illuminate :: Elicit :: Whirlwind Push :: Reflect :: Leaping Slash
Clopon
:: Summoning
Challseus
:: Teleport :: Brew Potions
Raina
:: Battle Stances
Misc
:: Multi Life Transfer :: Suspended Animation :: Multi Suspended Animation :: Holy Propulsion :: Dark Propulsion :: Shadow Leap :: Armageddon