The Superhero Database Classification number, or SHDB Class, is a number that represents the overall 'power' of a character. All traits of a character are used for calculating the Classification.
What it DOESN'T mean
This doesn't mean that a higher class would always beat a lower class character. But the bigger the difference in Class is, the more obvious it is who'll win in a fight.
How is this calculated
( INT^1.3 + (STR*0.5 )^2 + (SPE*0.5)^2 + DUR^1.6 + (POW + (SPS*SPL))^2 + COM^1.8 ) ^ TIER
Super Power Score and Level
Every Super Power has a score (SPS) that is used to calculate the Class. Each Super Power also has 3 levels (SPL). The level is set when connecting that Super Power to a character. The level determines the final score, of the Super Power, being used in the calculation.
Oneness is basicly when you use ''100%'' of the power of the light side.
Jacen Solo achieved true Oneness with the force.
''What he found instead was formless, supple, and fathomless-an infinite emptiness, but as serene as a wind toppling trees to encourage new growth. A being of light, Jacen was drawing into himself all of Onimi's lethal compounds, neutralizing them and casting them out as sweat, tears, and exhalations. He understood at last why he had failed to catch Anakin's lightsaber when Luke had tossed it to him: he was never meant to catch it, because he had become the lightsaber. He had attained the ability to cut through any resistance in himself; to sever the bonds of preconception; to open a gaping hole into a reality more expansive than any he had ever dared imagine; to heal.''
''As his grandfather had done, he had broken through the apparent opposites that concealed the absolute nature of the Force, and found his way into an unseen unity that existed beyond the seeming separateness of the world. For a moment all the cosmic tumblers had clicked into place, and light and dark sides became something he could balance within himself, without having to remain on one side or the other.''
''The consciousness that was Jacen Solo was strewn across the vast spectrum of life energy. He had passed beyond choice and consequence, good and evil, light and dark, life and death. All that had been required of Jacen was complete surrender-a technique once mastered by the Jedi Order but at some point misplaced; transposed to an emphasis on individual achievement, which had opened a way to arrogance. In that the path was available to any who chose to seek and follow it, Jacen understood that the discovery was really a rediscovery.''
-- New Jedi Order: The Unifying Force
Note: the normal oneness can do this: ''She described as being in all times, all places, and all things.''
https://starwars.fandom.com/wiki/Oneness