Lamia's Tiara

Lamia's Tiara is a recurring piece of equipment in the series. It is usually a mid to high-ranked helmet that grants several bonuses to the player.

Final Fantasy V
Lamia's Tiara is the 2nd strongest Hat in the game, with Ribbon being the strongest. It is used by the magic-based jobs, and can only be obtained by defeating Lamia Queens. It provides +3 Defense, +7 Magic Defense, +10 Magic Evasion, +3 Magic, increases chance of using Sword Dance through Dance, and is one of the only ways to prevent Confusion.

Final Fantasy IX
Lamia's Tiara is a mid-ranked hat that the mages and Zidane can equip. It provides +17 Magic Defense, +1 Magic and Spirit, and halves damage from Wind elemental attacks. It teaches the abilities Clear Headed, Confuse, and Float.

Final Fantasy XII
Lamia's Tiara is a mid-ranked Mystic Armor that requires 25 LP to use and costs 3200 Gil to buy. It provides +25 Magic Resistance, +4 Magic, and +7 Vitality.

Final Fantasy Crystal Chronicles: Ring of Fates
Lamia Hairclip' requires the Lamia's Allure scroll to use, and provides +28 Defense and +6 Magic.