Lilith's Kiss

Lilith's Kiss (リリスのくちづけ), also known as LilithKiss, Succubus, or Kiss of Lilith, is a recurring item in the series. It has the opposite effect of Vampire Fang, in that instead of draining the target's HP and restoring the user's HP equal to that amount, it drains MP instead. It is usually a rare item.

Final Fantasy III
Lilith's Kiss, unlike in the other appearances, acts as a Vampire Fang, and drains HP instead of MP. It cannot be bought, but can be found in various chests and dropped/stolen from many enemies.

Final Fantasy IV
Lilith's Kiss casts Osmose when used as an item, and can be won from Vampire Girl, Vampire Lady, or Lilith. One can be found in the upper portion of the Tower of Babil, and more can be stolen from Liliths.

Final Fantasy IV: The After Years
Lilith's Kiss casts Osmose and can be won from Liliths and Succubus.

Final Fantasy V
Although not a usable item, Lilith's Kiss can be used via the Mix command and drains MP from the enemy. It is created by mixing a Maiden's Kiss with either an Ether or an Elixir.