Command Meld

Yes, the untapped power that lies within you. Now, child, it's time you awakened that power and realized your full potential.
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Command Meld is a system in Kingdom Hearts Birth by Sleep that replaces the traditional Item Synthesis. Command Meld allows the character to create new Deck Commands by combining two previously obtained commands; the resulting Command will differ based on the types and level of the ingredient Commands. Furthermore, synthesis materials, such as the Fleeting or Abounding Crystal, can be added to the mix. This does not affect the resulting Command, but instead attaches a certain Ability to the Command, depending on the material and the final Command. If one of the ingredient Commands already has an attached Ability, the resulting Command will also have an Ability of the same category, and it is also possible to have an Ability attach to the resulting Command completely at random. Like in Final Fantasy games, this ability will be equipped with the Command, and will level up as long as the character gains Command Points. Once the Support Ability gains maximum experience, it will be moved the character's permanent Abilities list, allowing them to use it no matter what commands they equip. It is also possible for the Command created to upgrade to a higher level Command. The few Shotlocks available through Melding can only be created in this manner.

For example, mixing a Lvl 3 Fire Surge and a Lvl 3 Aero will produce Aerial Slam. If a Soothing Crystal is added to the mixture, the Aerial Slam will have an attached HP Boost ability.

Trivia

• Like many other gameplay features in Kingdom Hearts Birth by Sleep, Command Meld is similar to a gameplay feature in Crisis Core -Final Fantasy VII-, known as Materia Fusion.