The Ability system in Kingdom Hearts Union χ is implemented entirely through Medals.
The primary type of ability is Special Attacks (アビリティ, Abiriti?, lit. "Ability"). Special attacks are tied to Medals, with each Medal having a different special attack. Medals may also have passive abilities attached to them in the form of Skills (スキル, Sukiru?), Traits (覚醒能力, Kakusei Nōryoku?, lit. "Awakening Ability"), and Special Traits (特別覚醒能力, Tokubetsu Kakusei Nōryoku?, lit. "Special Awakening Ability").
Special Attacks[edit]
Each Medal may have up to one Skill attached to it. A Skill can be added to a medal by fusing with a Scrooge Medal or Trait Medal.
Each Medal has between 1 and 5 Trait Slots to which a Trait can be assigned. Traits can be purchased from the Moogle Shop, and random traits can be obtained by fusing two of the same Medal together. Each Medal also has one Special Trait Slot to hold a Special Trait, a different set of abilities obtained exclusively through Spirit Training.
| Game mechanics
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| General mechanics
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Attack | Magic | Items | Party member | Stats | Gauges | Prizes
Synthesis | Moogle Shop | Report | Glossary | Abilities (KH, KHCOM, KHII, KHD, KHREC, KHBBS, KH3D, KHUχ, KHIII, KHDR)
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| Special combat and play mechanics
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| Commands
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Command Menu | Command Matrix | Command Deck (KHBBS, KH3D)
Reaction Command | Overlay command | Finish command | Special Command | Situation Command
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| Alternate action systems
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| Cards (Battle, Map, World) | Cards (KHχ) | Medal (KHUχ) | Cards (KHDR)
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| Alternate level systems
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| Mission Mode | Questploration | Quests | Music Stage
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| Character and stats mechanics
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| Panel System | Rank | Version Up | Stat Matrix | Gear Matrix | Command Meld | Drop System | Spirit
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| Movement mechanics
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| Lock-On | Swimming | Flowmotion | Free Running
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| Technique and action mechanics
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| Critical Hit | Summon | Sleight | Dark Mode | Drive Form | Limit | Limit Break | Debug Ability | Dimension Link | Command Style | Shotlock | Flowmotion | Reality Shift | Link System | Special Attack | Style Change | Attractions | Link Summon | Formchange
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| Rewards
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| Treasure Chest | Bonus Level | Experience | Tech Points | Munny | Moogle Point | Heart Point | VP | Medals | Rhythm Point
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| Enemy mechanics
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| Revenge Action | Reaction Endurance | Reality Endurance | Attraction Endurance | Armor Mode
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| Game elements
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| Opening Menu | The End | Difficulty Level | Tutorial | Game Over | Save Point | Game Clear Data | Theater Mode | Trophies
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