Which preposition to use with supernal

as Occurrences 1%

His wrath is as supernal as his love; he is inspired with the fiercest resentments; he exhibits the mighty anger of Homer's heroes; he never could forgive Joab for the slaughter of Abner and Absalom.

in Occurrences 1%

Its great merits are universally conceded; and while it has defects,great inequalities in both style and matter; some stanzas supernal in beauty, and others only mediocre,on the whole, the poem is extraordinary.

Which preposition to use with  supernal