Essence, the term used by Jasmine and the researchers.
It's the vitality version of Mana, unlike Mana that can be wield and transformed into multiple different spells, essence only has one ability, to enhance any attack or skill of the user.
Because of it's simple ability, it's enhancement is incredibly absurd.
By combining both vital force and spiritual energy, a martial artist can even defeat those that are much higher rank them.
Sean doesn't know this, it's because his ability to use essence is so natural, he doesn't know that almost all of those that uses essence requires their core to store such energy.
"I guess, the condition for your breakthrough requires you to bathe in the power of the sun, that means that we need to find a world that's burned by their sun."
"I can do it!" Wuk states with determination.
"I know you can, you are the Invincible War God of our world, the only thing that's going to be difficult is finding such a world."
Wuk and Jasmine frowns.
