The Vampiress is an enemy in Final Fantasy IV: The After Years. She primarily fights by either inflicting Sap to a party member with Bloodfeast, or by inflicting Confusion via Glare. She is not a difficult enemy to defeat however, and any weapons that are Holy-elemental or Fire-elemental will destroy her quickly.
Vampires are mythological or folkloric beings who subsist by feeding on the life essence, generally in the form of blood, of living creatures. Although vampiric entities have been recorded in many cultures, and may go back to "prehistoric times", the term vampire was not popularized until the early 18th century.