Siren (Final Fantasy V)

Siren is a boss in Final Fantasy V. She deceives the party into letting their guard down, by impersonating Bartz's mother and King Tycoon, but her attempt to ensnare Galuf by impersonating Krile fails when Galuf cannot remember who Krile is due to his amnesia. As such, Galuf gets the other party members to snap out of their trances, and the Siren takes a more direct approach to taking care of the party.

In the Advance version, Siren can be fought in the Cloister of the Dead section of the Sealed Temple.

Strategy
Siren can switch between Alive and Undead statuses at will. While Alive, Siren is weak to physical attacks, but elemental attacks prove to be ineffective. Knights should attack her while Black Mages defend. She will attack using Blizzard spells, while trying to put the party to Sleep and Silence them. She will also cast Haste on herself and try to cast Slow on the party. Most annoyingly, she will heal herself occasionally.

While Undead, Siren is immune to physical damage, but weak to magic, especially Fire. Despite her Undead status using a Phoenix Down on her will not kill her. Black Mages should cast Fire spells on her while the Knights defend. If the player has any White Mages, they should cast Cure spells on her too, since this will hurt her now. Siren will physically attack the party for some heavy damage. She also has a Poison spell, White Mages should have Poisona if possible. Although Siren is somewhat more dangerous while Undead, she is vulnerable to Fire and over 100 damage can be dealt to her using the spell.

Siren might also use the Libra spell and waste a turn doing so.

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Sirena (Final Fantasy V)