(OFF TOPIC) Who would win in a fight?

Not necesarily, it’s more “different rules” rather then breaking the rules with no rules of their own
Needless to say the Hax that are spirit attacks can be resisted by any hero with spiritual resistance like well for example if Memory serves the Nephalim had resistance to the soul leaching powers at least to some extent so they would best Arthas easily,
Another example from fiction is Devil May Crys Dante (though Dante is the kind of Op it would take to go 1v millions against the Zerg so… yeah let’s not get into that one)