This won't hurt...much!Lulu, Final Fantasy X
Gravity (グラビデ, Gurabide?, lit. Gravide), also known as Demi, is a recurring fractional damage spell from the Final Fantasy series. In a few games it appears in, it's a Gravity-elemental spell. It cuts an enemy's HP by a specific amount, usually by 50% or 25%, although this depends on the game. The number of _targets it affects is also game dependent.
In most cases, the spells in the Gravity family are not lethal and round half down to the damage value. If the _target's remaining HP is 1, the resultant damage will be zero. The damage values of Gravity and Graviga of Final Fantasy IX, Final Fantasy XII, and Final Fantasy Tactics are based on the _target's maximum HP as opposed to remaining HP like in other installments, making them actually lethal.
The upgrades of Gravity are called Graviga, also known as Quarter or Demi 2, and Gravija. The Compilation of Final Fantasy VII and the Final Fantasy Crystal Chronicles series are by now the only games that include the -"ra" tier spell, Gravira, of the Gravity family. The Graviga spell has been localized as "Gravity" for Final Fantasy VII Remake.
Appearances
Final Fantasy V
Time Mages can cast Gravity (also called Demi) as a Level 3 Time Magic spell. It can be bought from Karnak for 620 gil, requires 9 MP to cast, and is non-elemental. Enemies with the hidden "heavy" property are immune. The enemies Chrono Controller, Exdeath in the first fight, Hole, Omniscient, and Atomos can use the spell against the party.
Final Fantasy VI
Gravity (Demi on the SNES) is an Attack spell taught by Phantom. Gravity reduces the _target's HP by 1/2, costs 33 MP to cast, has a hit rate of 120, but will fail against those immune to Death. It is vulnerable to Runic. Daedalus, Level 20 Magic, Necromancer, Angel Whisper, Zone Eater, and Zurvan are capable of casting this spell.
Final Fantasy VII
Demi is the first spell available through the Gravity Materia. It costs 14 MP to cast. Barret can use this spell in the 1996 demo release for the cost of only 5 MP, but its effect is the same as the effect of Demi2 in the final game. Deenglow is the only enemy to use the spell against the player. Gravity spells deal Gravity-elemental damage, which some monsters can resist or absorb.
Before Crisis -Final Fantasy VII-
Gravity appears as a Materia.
- MP Cost: N/A
- _target Type: Range
- Materia Generation System: Pink, Purple
- Level 1 - Default - Base Damage: N/A
Crisis Core -Final Fantasy VII-
The Gravity Materia conjures an orb of darkness to fall on an opponent. It explodes on contact, dealing damage to all enemies in range equal to 25% of their HP. Gravity costs 22 MP to cast. Gravity cannot be purchased at the shop, although a stronger version of it, Graviga, can be. It also can't be made through Materia Fusion. G Deleters drop Gravity Materia.
Final Fantasy VII Rebirth
Gravity is the first tier spell of the 
Gravity Materia, itself purchased from Chadley's Corel Region shop for 15 data points. Gravity deals 25% of the enemy's maximum health as fractional damage to it up to 9999 without the Genji Glove equipped, though many enemies are immune to fractional damage.
Sandhog Pie also uses it against the player.
Final Fantasy VIII
Demi is a Gravity-based spell, which decreases a single opponent's HP by 1/4 of its current HP and is quite useful on many powerful enemies, such as the Tonberry. Demi is drawn from opponents and draw points and refined from items with Diablos's Time Mag-RF. The player can also get one Demi spell from Zell's "love quest" if they give Beef & Pink as the answers to a "survey" held by girls at the Balamb Garden library, and later return for the results.
Casting Demi in battle increases compatibility with Diablos by 2, and is one of the few spells that doesn't lower compatibility with any GF when cast.
Since Angel Wing makes spells do five times the damage, Demi has the potential to defeat an enemy as it deals damage equal to 1.25 times the opponent's current HP, though capped at 9999.
Final Fantasy IX
Vivi can learn the Black Magic spell Demi for 30 AP from the Cypress Pile, Black Belt, and Amethyst. It costs 18 MP to cast, deals 30% of the _target(s)' max HP as damage (60% with Reflectx2), and its damage is unaffected by multi-_targeting. It can be reflected and works with Return Magic. It has an accuracy of 40%.
In the first encounter with Kuja, he casts Demi frequently.
Final Fantasy X
Demi is a Black Magic spell found in Lulu's section of the Sphere Grid. Demi affects all units of the _target party and inflicts damage equal to one quarter of their current HP, capped by the damage limit. The resultant damage is rounded down, meaning a character with three HP or below will take no damage from Demi. In Lulu's Fury Overdrive each casting of Demi inflicts damage equal to one eighth of all enemies' current HP.
It can be used by Abaddon, Anima (Remiem Temple), Black Element, Catastrophe, Dark Flan, Omega Weapon, Sinspawn Ammes, Sinspawn Gui, and Varuna.
Final Fantasy X-2
Demi is part of the Arcana spellset of the Dark Knight dressphere, and requires 20 AP to master. It can also be used by equipping the Black Ring accessory or by passing through the red gate on the Downtrodder Garment Grid, or via Lady Luck's Magic Reels by rolling three Skulls. It costs 10 MP to cast and reduces the HP of the _target party by 25%. Several enemies are capable of casting the spell against the party, including Trema and Paragon (Oversoul).
Demi Sword is an ability used by the Warrior dressphere that requires Flametongue, Ice Brand, Thunder Blade, and Liquid Steel to be mastered. It takes 60 AP to master and costs 6 MP to use. It inflicts Gravity-elemental damage to one _target.
Final Fantasy XI
Gravity is a level 21 Black Magic spell cast by Red Mages. It lowers a _target's Evasion by 10 points and inflicts the Weight status effect, which decreases physical movement speed.
Final Fantasy XII
Gravity causes damage equal to 25% of the enemy's max HP and hits all _targets in range. Gravity spells have a chance to miss. Gravity's base success rate is 70%, but it is also affected by the caster's Magick Power and the _target's Vitality. Bosses, marks, Rare Game, and other tough foes are immune to fractional damage due to their Safety augment.
In the original PlayStation 2 version, Gravity is part of the Arcane Magicks 2 license on the License Board and costs 30 License Points. The spell can be bought in Rabanastre (after defeating Belias), Eruyt Village, and Mt Bur-Omisace for 2,800 gil.
In the Zodiac versions, Gravity is a Time Magick 4 license and can only be used by the Time Battlemage. The spell is bought for 2300 gil from shops after the events that follow entering Ondore's Estate.
Final Fantasy XII: Revenant Wings
Gravity is used by the Yarhi, Diabolos. It deals damage equal to 25% of the enemy's max HP.
Final Fantasy XIII-2
Gravity is an ability that appears in the opening sequence, during the Cinematic Action in which Lightning battles with Caius. It only appears once, alongside Ruinga, as an option. If chosen, Lightning uses the spell to attract surrounding debris towards Caius, trapping him inside. Afterwards, the ability is not seen for the rest of the game.
Final Fantasy XIV
Gravity is an Astrologian ability unlocked at level 45 after completing the quest Ewer Right. It has a 1.5 second cast time and 2.5 second cooldown. It deals damage to multiple enemies, with a potency of 120, costing 400 MP. It can be upgraded to Gravity II at level 82, increasing its potency to 130.
Final Fantasy Tactics
Time magick that conjures up a supermassive field, inflicting damage with powerful gravitational forces.Description
Revenge with dark-evil spell! Demi!Upon casting (PlayStation)
Gravity (also called Demi) is a spell learned by Time Mages for 250 JP. It costs 24 MP to cast with the charging speed of 17. It reduces the HP of the _targets in the area by 1/4 of their max HP. The damage fraction is the same as Mystic Arts' Invigoration with nearly instant casting speed of 50 and ignoring _target's magickal evasion, but Gravity has higher hit-rate and can hit multiple _targets. It is effective against many of the Lucavi bosses due in part to their having a couple thousand HP and no resistance to Gravity.
Final Fantasy Tactics Advance
Gravity field. Saps 1/2 of _target's HP.Description
Demi is a spell that reduces HP by 1/2 for 24 MP. Time Mages can learn Demi from the Stardust Rod for 300 AP, while Babus knows the spell as the Runeseeker. It is stealable through the ability Steal: Ability, and is also susceptible to Return Magic and Absorb MP.
Final Fantasy Tactics A2: Grimoire of the Rift
Gravity is an Arcanist ability, reducing HP of a _target by 1/4 at the cost of 12 MP. It is learned for 250 AP through the Force Rod and has a range of 3.
Final Fantasy Crystal Chronicles
Gravity drags flying enemies to the ground and deals heavy damage to stone enemies. It is cast by fusing any two Element Magicite (Fire + Blizzard, Blizzard + Thunder, or Fire + Thunder).
Final Fantasy Crystal Chronicles: Ring of Fates
Gravity is cast by piling Fire, Blizzard, and Thunder. If cast on a player, they will not be able to jump for a short amount of time. It also deals moderate damage.
Final Fantasy Crystal Chronicles: Echoes of Time
Gravity binds the _target to the ground, preventing them from jumping. It is cast by stacking Blizzard and Raise _target rings.
Final Fantasy Dimensions
Final Fantasy Dimensions II
Theatrhythm Final Fantasy Curtain Call
Doomsday is a reactive ability that costs 19 CP to equip. It is activated just once in Battle Music Sequences (BMS) when the player makes a chain of 35 hits. It reduces the enemy's remaining HP by half. It is learned by Faris (level 80), Lenna (level 60), Krile (level 50), Sephiroth (level 45), Vincent (level 60), Vivi (level 40), Ashe (level 75), Ace (level 90), and Lightning #2 (level 85).
Theatrhythm Final Fantasy All-Star Carnival
Theatrhythm Final Bar Line
Final Fantasy Airborne Brigade
Final Fantasy Record Keeper
Gravity is a Black Magic ability with a Rarity of 2☆. It halves the _target's HP and can initially be used twice. It can be honed to Rank 5. It can be created by using Black Orb x5, Lightning Orb x3, Dark Orb x3, and 5000 gil.
Final Fantasy Explorers
Create an orb that draws foes in, dealing damage and potentially depleting 25% of enemy HP on contact.Description
Final Fantasy Brave Exvius
World of Final Fantasy
Gravity is an active ability that eliminates 1/4 of a single _target's remaining HP for 10 AP. It can be used by Death Searcher and Nightmare.
Chocobo's Dungeon 2
Non-Final Fantasy appearances
Other Square Enix titles
Gravity (グラビデ, Gurabide?, lit. Gravide) has appeared in other Square Enix titles as an ability, referencing the Final Fantasy spell.
Gravity, along with its tiers Gravira and Graviga, are recurring spells in the Kingdom Hearts series. In the first Kingdom Hearts and Chain of Memories, the spell creates an orb of darkness that crushes an enemy and reduces their HP by a set fraction. Birth by Sleep and Dream Drop Distance introduce the Zero Gravity (ゼログラビデ, Zero Gurabide?) spells, which hurls enemies into the air where they are sapped of HP and vulnerable to Confuse. Both games feature Zero Gravira (ゼログラビラ, Zero Gurabira?) and Zero Graviga (ゼログラビガ, Zero Gurabiga?) as upgraded forms, while Dream Drop Distance features a fourth tier known as Zero Graviza (ゼログラビガン, Zero Gurabigan?, lit. Zero Gravigun).
Gravity is featured as a recurring Time Magic spell in the Bravely series, serving as an intermediate spell for Time Mages in titles associated with the first Bravely Default. Like its Final Fantasy predecessor, it has a chance of dealing damage equal to half of maximum HP to one _target and will not work on bosses.
Gallery
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Etymology
Gravity, or gravitation, is the natural phenomenon by which physical bodies appear to attract each other with a force proportional to their masses. It is most commonly experienced as the agent that gives weight to objects with mass and causes them to fall to the ground when dropped.
It is also called "Demi". Demi is a prefix meaning "half", from the Latin dīmidium meaning "divided in half". This is sometimes a misnomer as the spell of that name does not necessarily reduce a foe's remaining health by half.
Gravity does percentage-based damage on the _target's HP, thus doing more damage to enemies with more HP. This is roughly analogous to the fact that the larger a mass is, the greater the gravitational force it exerts on objects around it.