Dark Energy is a sectret item from Final Fantasy XII: IZJS. Player can't obtain it by usual means (buying from shop or stealing it from monster) and have to use memory editor to access it.
In battle
Fran is using Dark Energy on Hyena
Using Dark Enery does not require charging and can be used by acharacter with any job (like any other item). Dark Energy deals 50.000 HP of damage to all visible foes and have animation of Megalixir.
Etymology
In physical cosmology and astronomy, dark energy is a hypothetical form of energy that permeates all of space and tends to accelerate the expansion of the universe.[
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