Sense Energy

"If I recall correctly, it's released from a human's body, and is made up of minute particles…or something like that?"

- Hayato Kisaragi describing sense energy

Sense Energy or just Energy is the main power source of the abilities of both Slayers and Hunters.

Description
Sense Energy is described as being a power which is invisible to the naked eye and is released from the human body made is made up of things referred to as minute particles. This form of energy is also what the Hundreds react to resulting in them taking on their weaponized forms.

Whenever used in combat, a Slayer is able to use their Sense Energy to increase their physical abilities letting them handle fighting against savages. As it can be utilized to activate their Hundred, energy can be infused into them in order to increase their effectiveness as well as produce a number of effects.

However, ones' energy is limited and without it, their Hundred cannot maintain their form and it returns to their natural forms. Sense Energy is heavily linked to ones' emotions and/or their desires to where it's essential to activate in a person. When both the emotions and energies clash against one another, it could trigger a phenomenon known as "Sympathy".

It is later revealed that, as energy tends to be linked to ones' emotions and desire, there are some Slayers unable to display their true power in certain situations, as revealed by Hayato who lost against Liddy since his reason for fighting was to protect others not to compete for his own benefit.

Techniques
There are a number of techniques used with Sense Energy, which requires more training and control to utilize in combat:


 * E-Barrier: Typical for Slayers, through using their energy, it is possible to create a barrier to defend against attacks.
 * Accelerate: This is a technique, where the Slayer releases energy from their feet to enhance their speed, it can also be used to Jump, enhancing their jumping strength.
 * Energy Blast: Slayers are also able to release focused blasts from their Hundred using energy.

Trivia

 * Outside of Little Garden, Sense Energy is referred to as either "Ki" and "Magical Power".
 * The latter has been further elaborated in volume 3, as Claire caused a magic square when recreating her Alisterion's armaments.
 * The color of ones' Sense Energy varies.