Siren (Final Fantasy V)

Siren is a boss in the game Final Fantasy V. Tricking the party into losing their wills to fight, Galuf breaks the spell thanks to his amnesia. As such, the Siren takes a more direct approach to taking care of the party.

While Alive, Siren is weak to physical attacks, but elemental attacks prove to be ineffective. Have Knights attack her just now, while your Black Mages defend. She will attack using Blizzard spells, while trying to put your party to sleep and silence them. She will also cast Haste on herself and try and cast Slow on your party. Most annoyingly, she'll heal herself occasionally.

While Undead, the opposite applies, so have Black Mages cast Fire spells on her while your Knights defend. If you have any White Mages, have them cast Cure spells on her too, since this will hurt her now. Siren will now keep physically attacking your party now, for some heavy damage. She also has a Poison spell, so make sure those White Mages have Poisona.

One odd thing is that she also has the Libra spell. Don't question it, jsut attack her while she wastes a turn.

Other Appearances
Siren returns as an Esper in Final Fantasy VI and as a Guardian Force in Final Fantasy VIII.