Outsider can throw various weapons, the thrown weapons increasing in power every turn, and counters physical attacks by throwing a Shuriken and magic attacks by throwing a Fuma Shuriken, both of which are powerful. Their special attack. Dispatch, instantly kills its target. As it is a physical attack, it ignores protection from the Safety Bit and Memento Ring, which guard against magical Death. Interestingly, the Outsider uses Dispatch against itself on its sixth turn.
It is advised to cast Holy or Banish on Outsiders to kill them quickly before they wipe out the entire party. If it is controlled, it can also cast Flare and Banish.
The Outsider can be annoying to defeat, because it has not one, but two abilities that can instantly kill the player: the aforementioned Dispatch and Banish. However, its melee attack and Flare do minimal damage, so as long as Outsider's Death abilities do not hit, it can be defeated in a short time.
Should the player have mainly low-level characters, this can be an especially difficult victory to secure that may take multiple tries. A good bet for success may be to use Sabin Rene Figaro and hope for him to use Phantom Rush which, even at lower-levels, is a devastating move capable of inflicting massive damage.