Jarl vs Oni

[Tuidjy]

I would not launch anything sacred against the new guardians. Keep in mind, the
fatigue effect triggers always, they do not have to land a blow. Any sacred
SC, including a Seraph will get swamped and will faint in two-three turns. Of
course, those standing over his corpse are likely to be burned and blinded...

But a few naked Skrattir will have a good time (Quicken self, breath of winter, change shape)

By the way, casting Breath of Winter with a Niefel Jarl is impossible.