Soma Drop

Soma Drop (ソーマのしずく), also known as Soma, is a recurring item in the series. It increases a character's MP permanently by 10, and is often a very rare item in the games it appears in.

Final Fantasy
Soma Drop did not appear until the GBA/PSP/iOS versions. It is a very rare item, and is usually only found in the optional dungeons, such as Whisperwind Cove and Lifespring Grotto. The Faerie Tonic, bought at the Caravan, temporarily increases Max MP by 200.

Final Fantasy IV
Soma Drop is a very rare item that can be won from enemies, or is found throughout the game in chests. The item can be found in the original Japanese release of the game, but was removed along with other items for the Easy-Type version and American release for the SNES. It was added back into the game along with the other dummied items for the Playstation release and all subsequent releases. This was the first game in the series to have the Soma Drop item.

Final Fantasy IV: The After Years
Soma Drop cannot be won from any enemies and must be found throughout the entire game.

Crisis Core -Final Fantasy VII-
The Soma, unlike in other appearances, restores AP to the player. When ten are used in Materia Fusion the Materia can gain the AP+10% ability.

Final Fantasy Crystal Chronicles: Ring of Fates
SP Boost can be bought for 250 and increases Max SP by 1.

Etymology
Soma, or Haoma (Avestan), from Proto-Indo-Iranian *sauma-, was a ritual drink of importance among the early Indo-Iranians, and the subsequent Vedic and greater Persian cultures. It is frequently mentioned in the Rigveda, whose Soma Mandala contains 114 hymns, many praising its energizing qualities.