Ars Arcanum

Ars Arcanum (ラストアルカナム) is an ability that appears in Kingdom Hearts, Kingdom Hearts Final Mix, Kingdom Hearts: Chain of Memories, Kingdom Hearts Re:Chain of Memories, Kingdom Hearts II Final Mix, Kingdom Hearts 358/2 Days and Kingdom Hearts Birth by Sleep. It allows the user to attack enemies with a massive combo attack. In Kingdom Hearts and Kingdom Hearts Final Mix, it costs 4 AP to equip and 3 MP to use.

Kingdom Hearts and Kingdom Hearts Final Mix

 * Sora learns Ars Arcanum after defeating Captain Hook in Neverland.

Kingdom Hearts: Chain of Memories

 * Ars Arcanum is an Attack Sleight that Sora learns at level 37.
 * Its card combination is:

Kingdom Hearts Re:Chain of Memories

 * Ars Arcanum is an Attack Sleight that Sora learns at level 42.
 * Its card combination is:

Kingdom Hearts II Final Mix

 * Limit Form has Ars Arcanum as a default ability accessible from the Limit menu.

Kingdom Hearts Birth by Sleep

 * Ventus can create Ars Arcanum through Command Melding.

Kingdom Hearts Birth by Sleep
Ars Arcanum is an Ultimate-class Attack Command that can be melded through nine different recipes, listed in the Giga Attack Recipe.
 * The first recipe can be melded by Ventus, and is a recipe.
 * Aerial Slam (LV4) + Blitz (LV4)
 * The second recipe can be melded by Ventus, and is a recipe that has a 10% chance of transforming from Aerial Slam when Ventus melds it.
 * Aerora (LV3) + Fire Strike (LV3)
 * The third recipe can be melded by Ventus, and is a recipe that has a 5% chance of transforming from Slot Edge when Ventus melds it.
 * Cura (LV2) + Blizzard Edge (LV2)
 * The fourth recipe can be melded by Ventus, and is a recipe that has a 5% chance of transforming from Slot Edge when Ventus melds it.
 * Cura (LV2) + Poison Edge (LV2)
 * The fifth recipe can be melded by Ventus, and is a recipe that has a 5% chance of transforming from Blizzard Edge when Ventus melds it.
 * Quick Blitz (LV2) + Blizzara (LV2)
 * The sixth recipe can be melded by Ventus, and is a recipe that has a 5% chance of transforming from Blizzard Edge when Ventus melds it.
 * Quick Blitz (LV2) + Blizzard (LV2)
 * The seventh recipe can be melded by Ventus, and is a recipe that has a 10% chance of transforming from Blitz when Ventus melds it.
 * Quick Blitz (LV3) + Slot Edge (LV3)
 * The eighth recipe can be melded by Ventus, and is a recipe that has a 5% chance of transforming from Blizzard Edge when Ventus melds it.
 * Sliding Dash (LV2) + Blizzara (LV2)
 * The ninth recipe can be melded by Ventus, and is a recipe that has a 5% chance of transforming from Blizzard Edge when Ventus melds it.
 * Sliding Dash (LV2) + Blizzard (LV2)

Kingdom Hearts 358/2 Days
Although Ars Arcanum cannot be performed by any playable character, Xion can perform a modified version of Ars Arcanum in her third form.

Etymology
Ars Arcanum gets its name from the Latin ars meaning 'technique', 'skill' or 'art' and arcanum meaning 'hidden'.