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.
Ainz uses his final attack, "The Goal of All Life is Death", which drains the life of everything in its area of effect, but Alucard resists thanks to his immortal powers. Alucard then unleashes his true form, Schrodinger, which allows him to exist everywhere and nowhere at the same time, making him intangible and immortal.
However, Ainz invokes his ultimate magic, "Iä Shub-Niggurath", which creates a portal to the absolute void, which not only rips apart space-time, but also annihilates any lifeforms within it. Alucard gets sucked into the absolute infections and disappears forever.
The winner of this battle is Ainz Ooal Gown.