Skill is one of the four main commands in Final Fantasy X, and all of them are basically physical attacks that have something attached to them, either an ailment or some other effect.
Skill
MP
Description
Sphere Grid Section
Dark Attack
5
Inflicts Darkness on an enemy for three turns
Wakka
Silence Attack
5
Inflicts Silence on an enemy for three turns
Wakka
Sleep Attack
5
Inflicts Sleep on an enemy for three turns
Wakka
Dark Buster
10
Always inflicts Darkness on an enemy for one turn
Wakka
Silence Buster
10
Always inflicts Silence on an enemy for one turn
Wakka
Sleep Buster
10
Always inflicts Sleep on an enemy for one turn
Wakka
Delay Attack
8
Delays target’s next turn
Tidus
Delay Buster
18
Greatly delays target’s next turn
Tidus
Zombie Attack
10
Inflicts Zombie status on an enemy
Auron
Triple Foul
24
Inflicts Darkness/Silence/Sleep on an enemy for three turns
Wakka
Extract Power
1
Allows target to drop Power Spheres
Auron
Extract Mana
1
Allows target to drop Mana Spheres
Kimahri
Extract Speed
1
Allows target to drop Speed Spheres
Tidus
Extract Ability
1
Allows target to drop Ability Spheres
Wakka
Power Break
8
Halves target’s Strength
Auron
Magic Break
8
Halves target’s Magic
Auron
Armor Break
12
Reduces target’s Defense to 0 and nullifies Armored status
Auron
Mental Break
12
Reduces target’s Magic Defense to 0
Auron
Full Break
99
Inflicts Power/Magic/Armor/Mental Break on an enemy
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