Chrom is a powerful swordsman and he’s one of the more impressive Fire Emblem characters. He could definitely give Sephiroth a good fight in pure swordsmanship, but Sephiroth has a lot of other abilities to back him up. The Advent Children film really amped up all of his abilities and it made him a very large threat. He can now fight at a higher level than most other swordsmen and he would overwhelm Chrom with his pure speed. Sephiroth wins.