Suggested by Destroyer Nightmare is skilled with a sword and won’t back down easy. Lets ignore for a moment that Pyrrha Nikos couldn’t just manipulate his armor and crush the guy. His swordsmanship will be enough to help him clash with Pyrrha for a while, but even then she has the edge thanks to her speed. She would be landing quite a few blows on Nightmare while still being able to block or parry his. It’s a fairly one sided battle where the victor is never in doubt. Pyrrha Nikos wins.