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.
KING THanos He killed everyone until The living tribunal.. but when Thanos was going to face the fallen one he was literally trembling with fear.
Cosmic King Thor (with the energy of galactus fully fed) and Fallen one are on the same level because they can both kill multiversal threats.
For example 616 Abraxas could even slaughter a tons of Galactus from another reality with easily
616 Hela could even beat CGR like a fly.
TLT from that reality or other reality wasn't even as powerful as 616 TLT, and King Thanos wasn't even that powerful at all.
616 Blue Marvel even can beat King Hyperion.
And look at previous comics, Thanos needs a lot of amped to be TLT level threat but on that reality (Earth-TRN666) it's all just a bullshit.
Fully Fed/Well Fed Galactus even more powerful than Lifebringer Galactus and several times Cosmic King Thor can beat him easily and in the end, Cosmic King Thor turning him into bomb that makes Black Winter disappear.
Black Winter is easily Multi-Eternity level threat and is declared as "All-Death" and more powerful than Multi-Eternity.
Silver Surfer says Black winter is the end of everything and what is meant *Everything* is no one but Multi-Eternity.