Bubble (status)

Bubble is a Status Effect introduced in Final Fantasy XII and is also the name of the Arcane Magick spell which causes said effect. the effect has also appeared in the DS version of Final Fantasy IV. The Bubble status is beneficial to a character as it doubles a party member's HP till the end of battle.

Final Fantasy IV
The Bubble status appears in the DS version of Final Fantasy IV and it is accessible either through Tellah's Recall ability or through Kain with Twincast when paired up with either Cecil or Rosa. It doubles the entire party's maximum HP.

Final Fantasy V
The mix Giant Drink and the Goliath Tonic item double a party member's HP.

Final Fantasy X
Although the status is not known as Bubble, double HP can be achieved during battle when the player uses a Stamina Tablet or Stamina Tonic. The effect can also be gained via Rikku's mixes Vitality, Mega Vitality and Hyper Vitality.

Final Fantasy X-2
The Songstress can double the party's HP with the Carnival Cancan dance.

Final Fantasy XI
While there is no Bubble status in Final Fantasy XI, the temporary item Giant's Drink can be used to raise your max HP by 50%. This item is usually only found in large events such as Besieged or Campaign, where one would need the extra hit points to survive.

Final Fantasy XII

 * "The character brims with life, doubling max HP. The effect is temporary."

Bubble is both a status effect and the Arcane Magick spell that causes it. Bubble doubles the maximum HP of the character it is cast upon. Unlike similar abilities from previous games (the Berserker's Howl in Final Fantasy X-2, for example) it also raises the current HP to reflect the new maximum limit. As an added effect, characters in Bubble status will be immune to Disease in addition, if a character is already inflicted with Disease, Bubble will cure it.

Bubble Belts can be equipped to induce a permanent Bubble status. These can also be bought from the Clan Provisioner after achieving the rank of Riskbreaker (though it is unavailable while your Clan Rank is Paragon of Justice). One will also become available through the Bazaar, and Bubble Belt can also be randomly found in a respawning treasure in Barheim Passage's East-West Bypass, in the deadend bit, when the Diamond Armlet is equipped. Also Bubble Belts is a reward from Antlion hunt.

Final Fantasy: The 4 Heroes of Light
The Fighter's Chakra ability doubles their own HP for the duration of the battle. The spell Lux increases the whole party's HP by 1.5 times.