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.
Arishem seemed to outclass Odin (Destroyer Armor) so obviously and signficantly, it's likely Arishem also scales higher than Galactus.
But I'm not sure, maybe they're more evenly matched than it seems.
odin has defeated against celestials
but Galactus could beat them ? :D
arishem was just one of the celestials in that army when odin fought with them
@Monster
but he can even beat galactus solo