Shooting Star causes Eject. Eject does not work on ANY of the Arena Creations. (it also defeats the purpose of the Arena, you WANT to fight the monsters, if you Eject, it does not give EXP or items for that monster)

And if you are actually referring to Banishing Blade, if it says "immune" to using the normal Breaks, then Banishing Blade will not work. (only deals damage)

Immunity works like this, for all them Status newbs.

Let's say I'm fighting a flan. If Auron used Armor Break, then the Flan's armor should be low enough for other characters like Tidus to attack normally. If it did not work, but no words popped up, then it did not work, but it does not mean that the monster has immunity. If it did not work, and the words IMMUNE appeared as the attack commenced, then the Armor Break will NEVER inflict Armor-Down.

Banishing Blade will only deal the four status-downs IF AND ONLY IF the words IMMUNE do not appear. If you used Banishing Blade, and the words IMMUNE popped up, then the monster is immune to all four status-downs. If not, then it is weak to at least one of them.

The success rate of Banishing Blade is 100%, so if the Flan is NOT IMMUNE to Armor-Break, then Armor Break WILL WORK GUARANTEED. Otherwise, it will not inflict Armor-down. A bonus for all the overdrive newbs is that if an enemy is immune to at least one ailment, then the damage of Banishing Blade is increased proportionally.