Energy

Energy is the term used to describe energy stored in a Crystal, which is pretty obvious, although it comes in different forms.

Neutral Energy doesn't belong to anyone. It can be used by anyone, yet it is significantly weaker due to a lack of purpose.

Elemental Energy or Type Energy can only be used by related Crystals, but it's stronger due to specialization.

Supercharged energy comes from entities with large amounts of strong emotions or Determination. It deals much, much more damage than normal energies.

There's also Good and Evil energy attributes.

"Good" energy usually provides more positive emotions in the user. Most healing attacks use Good Energy.

"Evil" energy usually provides more negative emotions in the user and bystanders. Most Shade or Nightmare attacks use Evil Energy.